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<article id="post-13764" class="post-13764 post type-post status-publish format-standard has-post-thumbnail hentry category-internet-access category-routing tag-arp tag-ct-artikel tag-challenge tag-dynamic-routing tag-firewall tag-icmp tag-icmpv6 tag-ipv6-neighbor-cache tag-tcpdump tag-troubleshooting tag-tshark tag-vlan tag-wireshark">
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<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2025/09/ICMP-Meldungen-zur-Fehlersuche-im-Netz-einspannen-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" fetchpriority="high"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/icmp-meldungen-zur-fehlersuche-im-netz-einspannen/" rel="bookmark">ICMP-Meldungen zur Fehlersuche im Netz einspannen</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/icmp-meldungen-zur-fehlersuche-im-netz-einspannen/" title="Permalink to ICMP-Meldungen zur Fehlersuche im Netz einspannen" rel="bookmark"><time class="entry-date" datetime="2025-09-13T13:04:38+02:00">2025-09-13</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/network/internet-access/" rel="category tag">Internet Access</a>, <a href="https://weberblog.net/category/network/routing/" rel="category tag">Routing</a></span><span class="tags-links"><a href="https://weberblog.net/tag/arp/" rel="tag">ARP</a>, <a href="https://weberblog.net/tag/ct-artikel/" rel="tag">c't Artikel</a>, <a href="https://weberblog.net/tag/challenge/" rel="tag">Challenge</a>, <a href="https://weberblog.net/tag/dynamic-routing/" rel="tag">Dynamic Routing</a>, <a href="https://weberblog.net/tag/firewall/" rel="tag">Firewall</a>, <a href="https://weberblog.net/tag/icmp/" rel="tag">ICMP</a>, <a href="https://weberblog.net/tag/icmpv6/" rel="tag">ICMPv6</a>, <a href="https://weberblog.net/tag/ipv6-neighbor-cache/" rel="tag">IPv6 Neighbor Cache</a>, <a href="https://weberblog.net/tag/tcpdump/" rel="tag">tcpdump</a>, <a href="https://weberblog.net/tag/troubleshooting/" rel="tag">Troubleshooting</a>, <a href="https://weberblog.net/tag/tshark/" rel="tag">tshark</a>, <a href="https://weberblog.net/tag/vlan/" rel="tag">VLAN</a>, <a href="https://weberblog.net/tag/wireshark/" rel="tag">Wireshark</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p>Sie sind Admin und Ihr Netz kränkelt. Wo fangen Sie an mit der Fehlersuche? Unser Tipp: <strong>Tasten Sie Ihre Netzwerkpatienten mal nach ICMP-Symptomen ab</strong>. Viele führen direkt zur Ursache.</p>
<p>Wenn man Netzwerkschluckauf behandeln muss, gilt Wireshark als eines der Lieblingswerkzeuge von Netzwerkadmins. Denn falsch angestöpselten oder fehlkonfigurierten Servern kommt man oft schon anhand eines Netzwerkmitschnitts auf die Spur und erspart sich so den Adminzugriff auf Abteilungsrouter oder -switches. Als behandelnder Admin müssen Sie das aufgefangene Paketkonfetti nur noch mit einem geeigneten Display-Filter sieben, um jene Paketsorte im Kescher zu behalten, die Fehlerhinweise gratis unter Ihre wissenden Augen bringt: die ICMP-Päckchen.</p>
<p> <a href="https://weberblog.net/icmp-meldungen-zur-fehlersuche-im-netz-einspannen/#more-13764" class="more-link">Continue reading <span class="screen-reader-text">ICMP-Meldungen zur Fehlersuche im Netz einspannen</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13197" class="post-13197 post type-post status-publish format-standard has-post-thumbnail hentry category-conference-talks category-internet-access category-network category-wireshark tag-best-practice tag-destination-unreachable tag-error tag-icmp tag-icmpv6 tag-sharkfest tag-troubleshooting tag-wireshark">
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<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2024/11/ICMP-Destination-Unreachable-Messages-@-SharkFest24-EU-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/icmp-destination-unreachable-messages-sharkfest24-eu/" rel="bookmark">ICMP ‘Destination Unreachable’ Messages @ SharkFest’24 EU</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/icmp-destination-unreachable-messages-sharkfest24-eu/" title="Permalink to ICMP ‘Destination Unreachable’ Messages @ SharkFest’24 EU" rel="bookmark"><time class="entry-date" datetime="2025-08-11T17:41:01+02:00">2025-08-11</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/conference-talks/" rel="category tag">Conference Talks</a>, <a href="https://weberblog.net/category/network/internet-access/" rel="category tag">Internet Access</a>, <a href="https://weberblog.net/category/network/" rel="category tag">Network</a>, <a href="https://weberblog.net/category/vendordeviceos/wireshark/" rel="category tag">Wireshark</a></span><span class="tags-links"><a href="https://weberblog.net/tag/best-practice/" rel="tag">Best Practice</a>, <a href="https://weberblog.net/tag/destination-unreachable/" rel="tag">Destination Unreachable</a>, <a href="https://weberblog.net/tag/error/" rel="tag">error</a>, <a href="https://weberblog.net/tag/icmp/" rel="tag">ICMP</a>, <a href="https://weberblog.net/tag/icmpv6/" rel="tag">ICMPv6</a>, <a href="https://weberblog.net/tag/sharkfest/" rel="tag">SharkFest</a>, <a href="https://weberblog.net/tag/troubleshooting/" rel="tag">Troubleshooting</a>, <a href="https://weberblog.net/tag/wireshark/" rel="tag">Wireshark</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p>I did a presentation at <a href="https://sharkfest.wireshark.org/retrospective/sfeu/sf24eu/" target="_blank" rel="noopener">SharkFest’24 EU</a> in Vienna, the “<a href="https://sharkfest.wireshark.org/" target="_blank" rel="noopener">Wireshark Developer and User Conference</a>“, about the topic: “<strong>Unveiling Network Errors – A Deep Dive into ICMP ‘Destination Unreachable’ Messages</strong>“. It covers the following:</p>
<p>“Effective troubleshooting of network issues is a critical concern for network technicians. While many are familiar with basic ICMP tools like ping and traceroute, the breadth of ICMP capabilities often goes underutilised. This session delves into ICMP messages, specifically the ‘Destination Unreachable’ type, and the insights they provide into network errors.</p>
<p>We will explore methods for capturing and analysing network traffic, highlighting practical tips and tricks for using Wireshark to diagnose and resolve issues efficiently. Attendees will gain a deeper understanding of ICMP message functions and how to leverage them for improved network troubleshooting.”</p>
<p>You can <strong>watch the whole session</strong> and download the slides. And you can do the six <strong>challenges</strong> at the end of the session as well. (The answers are not in the PDF, but shown in the video.)</p>
<p> <a href="https://weberblog.net/icmp-destination-unreachable-messages-sharkfest24-eu/#more-13197" class="more-link">Continue reading <span class="screen-reader-text">ICMP ‘Destination Unreachable’ Messages @ SharkFest’24 EU</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13685" class="post-13685 post type-post status-publish format-standard has-post-thumbnail hentry category-conference-talks tag-buzzwords tag-podcast">
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<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2025/07/Security-as-a-Podcast-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/security-as-a-podcast/" rel="bookmark">Security-as-a-Podcast</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/security-as-a-podcast/" title="Permalink to Security-as-a-Podcast" rel="bookmark"><time class="entry-date" datetime="2025-07-07T13:06:53+02:00">2025-07-07</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/conference-talks/" rel="category tag">Conference Talks</a></span><span class="tags-links"><a href="https://weberblog.net/tag/buzzwords/" rel="tag">Buzzwords</a>, <a href="https://weberblog.net/tag/podcast/" rel="tag">Podcast</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p>Es ist so weit – <strong>mein Kollege Florian und ich haben einen Podcast gestartet</strong>! 🎉</p>
<p>Der <strong>Security-as-a-Podcast</strong> beschäftigt sich mit Netzwerksicherheit – aber nicht im klassischen „Wir erklären euch die RFCs“-Stil, sondern eher aus der Perspektive von zwei Menschen, die selbst regelmäßig mit Security-Buzzwords bombardiert werden und manchmal nur halb wissen, worum es wirklich geht.</p>
<p><img loading="lazy" decoding="async" class="alignleft size-thumbnail wp-image-13677" src="https://weberblog.net/wp-content/uploads/2025/07/Security-as-a-Podcast-logo-150x150.png" alt="" width="150" height="150" srcset="https://weberblog.net/wp-content/uploads/2025/07/Security-as-a-Podcast-logo-150x150.png 150w, https://weberblog.net/wp-content/uploads/2025/07/Security-as-a-Podcast-logo-300x300.png 300w, https://weberblog.net/wp-content/uploads/2025/07/Security-as-a-Podcast-logo-1024x1024.png 1024w, https://weberblog.net/wp-content/uploads/2025/07/Security-as-a-Podcast-logo-768x768.png 768w, https://weberblog.net/wp-content/uploads/2025/07/Security-as-a-Podcast-logo-1536x1536.png 1536w, https://weberblog.net/wp-content/uploads/2025/07/Security-as-a-Podcast-logo.png 1921w" sizes="auto, (max-width: 150px) 100vw, 150px"/>Begriffe wie SASE, ZTA oder OT begegnen uns im Alltag ständig – in Projekten, in Meetings, auf Konferenzen. Doch wie oft bleibt davon wirklich was hängen? Und was davon ist mehr Marketing als Substanz?</p>
<p>In unserem Podcast sprechen wir genau darüber – miteinander und mit Experten. Ziel ist es, Wissen zu entwirren, einzuordnen und so aufzubereiten, dass es greifbar und verständlich wird – und im besten Fall auch im Kopf bleibt. Vom Business-Case hin zum Tool.</p>
<p> <a href="https://weberblog.net/security-as-a-podcast/#more-13685" class="more-link">Continue reading <span class="screen-reader-text">Security-as-a-Podcast</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13622" class="post-13622 post type-post status-publish format-standard has-post-thumbnail hentry category-palo-alto-networks tag-api tag-docker tag-palo-alto-networks tag-pan-os tag-pan-os-php tag-panorama tag-script tag-wsl">
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<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2025/05/Editing-Palo-Configs-by-Scripts-pan-os-php-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/editing-palo-configs-by-scripts-pan-os-php/" rel="bookmark">Editing Palo Configs by Scripts: pan-os-php</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/editing-palo-configs-by-scripts-pan-os-php/" title="Permalink to Editing Palo Configs by Scripts: pan-os-php" rel="bookmark"><time class="entry-date" datetime="2025-06-25T17:33:56+02:00">2025-06-25</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/vendordeviceos/palo-alto-networks/" rel="category tag">Palo Alto Networks</a></span><span class="tags-links"><a href="https://weberblog.net/tag/api/" rel="tag">API</a>, <a href="https://weberblog.net/tag/docker/" rel="tag">Docker</a>, <a href="https://weberblog.net/tag/palo-alto-networks/" rel="tag">Palo Alto Networks</a>, <a href="https://weberblog.net/tag/pan-os/" rel="tag">PAN-OS</a>, <a href="https://weberblog.net/tag/pan-os-php/" rel="tag">pan-os-php</a>, <a href="https://weberblog.net/tag/panorama/" rel="tag">Panorama</a>, <a href="https://weberblog.net/tag/script/" rel="tag">Script</a>, <a href="https://weberblog.net/tag/wsl/" rel="tag">WSL</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<p>There are recurring cases where tasks cannot be edited quickly and easily using the classic Palo Alto Networks GUI or Panorama. For example, <strong>editing multiple policies at once</strong>, such as during a zone migration. Or checking <strong>which policies haven’t log forwarding enabled, hence enabling it directly</strong>. Or <strong>finding unused objects, including deleting them</strong>.</p>
<p>For these situations (and many more!), there’s a tool with a wealth of predefined scripts: <strong>pan-os-php</strong>. This first blog post covers installation and some initial use cases.</p>
<p> <a href="https://weberblog.net/editing-palo-configs-by-scripts-pan-os-php/#more-13622" class="more-link">Continue reading <span class="screen-reader-text">Editing Palo Configs by Scripts: pan-os-php</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13460" class="post-13460 post type-post status-publish format-standard has-post-thumbnail hentry category-microsoft-azure category-ntp tag-azure tag-fail tag-ptp tag-time">
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<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2025/05/pawel-czerwinski-eybM9n4yrpE-unsplash-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/azure-ptp-accuracy/" rel="bookmark">Azure PTP Accuracy</a>
</h1>

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<span class="date"><a href="https://weberblog.net/azure-ptp-accuracy/" title="Permalink to Azure PTP Accuracy" rel="bookmark"><time class="entry-date" datetime="2025-05-22T09:01:32+02:00">2025-05-22</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/vendordeviceos/microsoft-azure/" rel="category tag">Microsoft Azure</a>, <a href="https://weberblog.net/category/network/ntp/" rel="category tag">NTP</a></span><span class="tags-links"><a href="https://weberblog.net/tag/azure/" rel="tag">Azure</a>, <a href="https://weberblog.net/tag/fail/" rel="tag">fail</a>, <a href="https://weberblog.net/tag/ptp/" rel="tag">PTP</a>, <a href="https://weberblog.net/tag/time/" rel="tag">time</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/sommarsste/" title="View all posts by Steven Sommars" rel="author">Steven Sommars</a></span> </div>
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<div class="entry-content">
<p>The<a href="https://datatracker.ietf.org/doc/html/rfc5905" target="_blank" rel="noopener"> Network Time Protocol</a> (NTP) is widely used to synchronize computer clocks. The <a href="https://en.wikipedia.org/wiki/Precision_Time_Protocol" target="_blank" rel="noopener">Precision Time Protocol</a> (PTP) can be used as a time source as well, which is expected to be accurate within microseconds. However, at <strong>Microsoft Azure VMs, PTP-derived time-of-day errors could exceed 50,000 microseconds</strong>, which may be inadequate. Let’s go into some details:</p>
<p> <a href="https://weberblog.net/azure-ptp-accuracy/#more-13460" class="more-link">Continue reading <span class="screen-reader-text">Azure PTP Accuracy</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13426" class="post-13426 post type-post status-publish format-standard has-post-thumbnail hentry category-ipv6 tag-dual-stack tag-fortigate tag-gua tag-ipv4-thinking tag-ipv6 tag-ipv6-global-unicast-address tag-isp tag-nat tag-network-design tag-nptv6 tag-soho tag-ula">
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<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2025/03/Bad-IPv6-Approaches-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/bad-ipv6-approaches/" rel="bookmark">Bad IPv6 Approaches</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/bad-ipv6-approaches/" title="Permalink to Bad IPv6 Approaches" rel="bookmark"><time class="entry-date" datetime="2025-04-25T18:10:27+02:00">2025-04-25</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/network/ipv6/" rel="category tag">IPv6</a></span><span class="tags-links"><a href="https://weberblog.net/tag/dual-stack/" rel="tag">Dual-Stack</a>, <a href="https://weberblog.net/tag/fortigate/" rel="tag">FortiGate</a>, <a href="https://weberblog.net/tag/gua/" rel="tag">GUA</a>, <a href="https://weberblog.net/tag/ipv4-thinking/" rel="tag">IPv4 Thinking</a>, <a href="https://weberblog.net/tag/ipv6/" rel="tag">IPv6</a>, <a href="https://weberblog.net/tag/ipv6-global-unicast-address/" rel="tag">IPv6 Global Unicast Address</a>, <a href="https://weberblog.net/tag/isp/" rel="tag">ISP</a>, <a href="https://weberblog.net/tag/nat/" rel="tag">NAT</a>, <a href="https://weberblog.net/tag/network-design/" rel="tag">Network Design</a>, <a href="https://weberblog.net/tag/nptv6/" rel="tag">NPTv6</a>, <a href="https://weberblog.net/tag/soho/" rel="tag">SOHO</a>, <a href="https://weberblog.net/tag/ula/" rel="tag">ULA</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p>I just got a few emails from an administrator of a medium-sized company, asking some IPv6 questions. They want to use IPv6 to reach the Internet, using two ISPs, while remaining IPv4-only on their internal networks. For whatever reason, they came across three different ideas that were almost completely wrong, speaking of a sound IPv6 design. But why? Maybe because <strong>IPv4 thinking is a bigger problem than we ever thought</strong>? Or because admins rely on firewall vendors (like Fortinet) that suggest completely wrong network approaches?</p>
<p>Let’s dig into some misconceptions concerning IPv6:</p>
<p> <a href="https://weberblog.net/bad-ipv6-approaches/#more-13426" class="more-link">Continue reading <span class="screen-reader-text">Bad IPv6 Approaches</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13544" class="post-13544 post type-post status-publish format-standard has-post-thumbnail hentry category-palo-alto-networks tag-april-1st tag-merchandising tag-palo-alto-networks tag-shirt tag-socks">
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<div class="entry-thumbnail">
<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2025/03/PANW-Announces-Strategic-Shift-to-Apparel-Manufacturing-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/palo-alto-networks-announces-strategic-shift-to-apparel-manufacturing/" rel="bookmark">Palo Alto Networks Announces Strategic Shift to Apparel Manufacturing</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/palo-alto-networks-announces-strategic-shift-to-apparel-manufacturing/" title="Permalink to Palo Alto Networks Announces Strategic Shift to Apparel Manufacturing" rel="bookmark"><time class="entry-date" datetime="2025-04-01T09:07:06+02:00">2025-04-01</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/vendordeviceos/palo-alto-networks/" rel="category tag">Palo Alto Networks</a></span><span class="tags-links"><a href="https://weberblog.net/tag/april-1st/" rel="tag">April 1st</a>, <a href="https://weberblog.net/tag/merchandising/" rel="tag">merchandising</a>, <a href="https://weberblog.net/tag/palo-alto-networks/" rel="tag">Palo Alto Networks</a>, <a href="https://weberblog.net/tag/shirt/" rel="tag">shirt</a>, <a href="https://weberblog.net/tag/socks/" rel="tag">socks</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p>Palo Alto Networks, a global leader in cybersecurity solutions, has announced a significant strategic shift. <strong>The company will transition from its core cybersecurity business to exclusively focus on apparel manufacturing</strong>.</p>
<p> <a href="https://weberblog.net/palo-alto-networks-announces-strategic-shift-to-apparel-manufacturing/#more-13544" class="more-link">Continue reading <span class="screen-reader-text">Palo Alto Networks Announces Strategic Shift to Apparel Manufacturing</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13440" class="post-13440 post type-post status-publish format-standard has-post-thumbnail hentry category-internet-access category-network category-routing tag-fragmentation tag-icmp tag-icmpv6 tag-ipv4 tag-ipv6 tag-mtu tag-ultimate-pcap tag-wireshark">
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<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2025/03/Path-MTU-Discovery-PMTUD-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/path-mtu-discovery/" rel="bookmark">Path MTU Discovery</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/path-mtu-discovery/" title="Permalink to Path MTU Discovery" rel="bookmark"><time class="entry-date" datetime="2025-03-24T20:31:59+01:00">2025-03-24</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/network/internet-access/" rel="category tag">Internet Access</a>, <a href="https://weberblog.net/category/network/" rel="category tag">Network</a>, <a href="https://weberblog.net/category/network/routing/" rel="category tag">Routing</a></span><span class="tags-links"><a href="https://weberblog.net/tag/fragmentation/" rel="tag">Fragmentation</a>, <a href="https://weberblog.net/tag/icmp/" rel="tag">ICMP</a>, <a href="https://weberblog.net/tag/icmpv6/" rel="tag">ICMPv6</a>, <a href="https://weberblog.net/tag/ipv4/" rel="tag">IPv4</a>, <a href="https://weberblog.net/tag/ipv6/" rel="tag">IPv6</a>, <a href="https://weberblog.net/tag/mtu/" rel="tag">MTU</a>, <a href="https://weberblog.net/tag/ultimate-pcap/" rel="tag">Ultimate PCAP</a>, <a href="https://weberblog.net/tag/wireshark/" rel="tag">Wireshark</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p>One of the mysteries for me in IP networks was the <strong>Path MTU Discovery (PMTUD)</strong> process. I’ve seldom seen any problems with the MTU at all. Fortunately, while troubleshooting some router issues, I captured several ICMP “packet too big” errors along with the original packets. 👍🏻</p>
<p><strong>Let’s have a look at those PMTUD processes for IPv6 and legacy IP with Wireshark</strong>. Of course, these captured connections are part of the <a href="https://weberblog.net/the-ultimate-pcap/">Ultimate PCAP</a> as well, hence, you can download the most current version of it and analyze it by yourself.</p>
<p> <a href="https://weberblog.net/path-mtu-discovery/#more-13440" class="more-link">Continue reading <span class="screen-reader-text">Path MTU Discovery</span> <span class="meta-nav">→</span></a></p>
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<article id="post-12889" class="post-12889 post type-post status-publish format-standard has-post-thumbnail hentry category-monitoring category-palo-alto-networks tag-api tag-global-counters tag-kpi tag-metrics tag-monitoring tag-palo-alto-networks tag-xml">
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<div class="entry-thumbnail">
<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2024/05/Which-KPIs-to-monitor-on-a-Palo-Alto-Firewall-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/which-kpis-to-monitor-on-a-palo-alto-firewall/" rel="bookmark">Which KPIs to monitor on a Palo Alto Firewall?</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/which-kpis-to-monitor-on-a-palo-alto-firewall/" title="Permalink to Which KPIs to monitor on a Palo Alto Firewall?" rel="bookmark"><time class="entry-date" datetime="2025-03-14T23:42:58+01:00">2025-03-14</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/monitoring/" rel="category tag">Monitoring</a>, <a href="https://weberblog.net/category/vendordeviceos/palo-alto-networks/" rel="category tag">Palo Alto Networks</a></span><span class="tags-links"><a href="https://weberblog.net/tag/api/" rel="tag">API</a>, <a href="https://weberblog.net/tag/global-counters/" rel="tag">global counters</a>, <a href="https://weberblog.net/tag/kpi/" rel="tag">KPI</a>, <a href="https://weberblog.net/tag/metrics/" rel="tag">metrics</a>, <a href="https://weberblog.net/tag/monitoring/" rel="tag">Monitoring</a>, <a href="https://weberblog.net/tag/palo-alto-networks/" rel="tag">Palo Alto Networks</a>, <a href="https://weberblog.net/tag/xml/" rel="tag">XML</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p>We wanted to monitor some of our Palo firewalls from our monitoring system via the API. But: <strong>Which enhanced metrics/KPIs shall we monitor?</strong> While there are some obvious ones such as interface counters, uptime, software versions, license expiry dates, or HA-states, we dug a little deeper to get more out of it, such as <strong>mgmt-/data-plane stats, packet rates, drop counters (all global counters?), and routing entries</strong>.</p>
<p>Here are some ideas on which values a monitoring system could observe. I’m listing the required API calls along with some demo values that can be used to develop monitoring tools/scripts.</p>
<p> <a href="https://weberblog.net/which-kpis-to-monitor-on-a-palo-alto-firewall/#more-12889" class="more-link">Continue reading <span class="screen-reader-text">Which KPIs to monitor on a Palo Alto Firewall?</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13305" class="post-13305 post type-post status-publish format-standard has-post-thumbnail hentry category-fortinet category-internet-access category-ipv6 tag-dhcpv6-pd tag-dsl tag-dual-stack tag-fortigate tag-pppoe tag-profishark tag-telekom tag-wireshark">
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<div class="entry-thumbnail">
<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2024/12/Dual-Stack-PPPoE-on-a-FortiGate-Firewall-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/dual-stack-pppoe-on-a-fortigate-firewall/" rel="bookmark">Dual-Stack PPPoE on a FortiGate Firewall</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/dual-stack-pppoe-on-a-fortigate-firewall/" title="Permalink to Dual-Stack PPPoE on a FortiGate Firewall" rel="bookmark"><time class="entry-date" datetime="2025-03-03T17:15:31+01:00">2025-03-03</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/vendordeviceos/fortinet/" rel="category tag">Fortinet</a>, <a href="https://weberblog.net/category/network/internet-access/" rel="category tag">Internet Access</a>, <a href="https://weberblog.net/category/network/ipv6/" rel="category tag">IPv6</a></span><span class="tags-links"><a href="https://weberblog.net/tag/dhcpv6-pd/" rel="tag">DHCPv6-PD</a>, <a href="https://weberblog.net/tag/dsl/" rel="tag">DSL</a>, <a href="https://weberblog.net/tag/dual-stack/" rel="tag">Dual-Stack</a>, <a href="https://weberblog.net/tag/fortigate/" rel="tag">FortiGate</a>, <a href="https://weberblog.net/tag/pppoe/" rel="tag">PPPoE</a>, <a href="https://weberblog.net/tag/profishark/" rel="tag">ProfiShark</a>, <a href="https://weberblog.net/tag/telekom/" rel="tag">Telekom</a>, <a href="https://weberblog.net/tag/wireshark/" rel="tag">Wireshark</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p>You can use a FortiGate to connect to the Internet (that is: Dual-Stack!) directly in various ways. In my current setup, I’m using a <strong>PPPoE residential xDLS connection</strong>. It’s not that easy to configure everything correctly since it requires the use of <strong>many different protocols such as PPPoE and PPPoEv6 (PPP IPV6CP) along with DHCPv6-PD</strong>. But here it is:</p>
<p> <a href="https://weberblog.net/dual-stack-pppoe-on-a-fortigate-firewall/#more-13305" class="more-link">Continue reading <span class="screen-reader-text">Dual-Stack PPPoE on a FortiGate Firewall</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13333" class="post-13333 post type-post status-publish format-standard has-post-thumbnail hentry category-dhcp-dhcpv6 category-fortinet category-ipv6 tag-bug tag-dhcpv6-pd tag-fortigate tag-fortinet tag-ipv6 tag-ipv6-dynamic-prefix tag-router-advertisement tag-wireshark">
<header class="entry-header">
<div class="entry-thumbnail">
<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2024/12/DHCPv6-Prefix-Delegation-on-a-FortiGate-Firewall-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/dhcpv6-prefix-delegation-on-a-fortigate-firewall/" rel="bookmark">DHCPv6 Prefix Delegation on a FortiGate Firewall</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/dhcpv6-prefix-delegation-on-a-fortigate-firewall/" title="Permalink to DHCPv6 Prefix Delegation on a FortiGate Firewall" rel="bookmark"><time class="entry-date" datetime="2025-02-13T16:05:14+01:00">2025-02-13</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/network/dhcp-dhcpv6/" rel="category tag">DHCP/DHCPv6</a>, <a href="https://weberblog.net/category/vendordeviceos/fortinet/" rel="category tag">Fortinet</a>, <a href="https://weberblog.net/category/network/ipv6/" rel="category tag">IPv6</a></span><span class="tags-links"><a href="https://weberblog.net/tag/bug/" rel="tag">Bug</a>, <a href="https://weberblog.net/tag/dhcpv6-pd/" rel="tag">DHCPv6-PD</a>, <a href="https://weberblog.net/tag/fortigate/" rel="tag">FortiGate</a>, <a href="https://weberblog.net/tag/fortinet/" rel="tag">Fortinet</a>, <a href="https://weberblog.net/tag/ipv6/" rel="tag">IPv6</a>, <a href="https://weberblog.net/tag/ipv6-dynamic-prefix/" rel="tag">IPv6 Dynamic Prefix</a>, <a href="https://weberblog.net/tag/router-advertisement/" rel="tag">Router Advertisement</a>, <a href="https://weberblog.net/tag/wireshark/" rel="tag">Wireshark</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p>I got <strong>DHCPv6-PD aka prefix delegation</strong> up and running on a FortiGate. Yes! ✅ Configuring it is tricky since it’s not always clear which options to use. You cannot see everything in the GUI (it even changes depending on other options made later on or selects hidden and wrong default values), hence, you must <strong>set specific options via the CLI</strong>. I navigated around some bugs and finally got it running. Here we go:</p>
<p> <a href="https://weberblog.net/dhcpv6-prefix-delegation-on-a-fortigate-firewall/#more-13333" class="more-link">Continue reading <span class="screen-reader-text">DHCPv6 Prefix Delegation on a FortiGate Firewall</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13299" class="post-13299 post type-post status-publish format-standard has-post-thumbnail hentry category-internet-access category-ipv6 category-palo-alto-networks tag-dhcpv6-pd tag-dsl tag-dual-stack tag-palo-alto-networks tag-pppoe tag-profishark tag-telekom tag-wireshark">
<header class="entry-header">
<div class="entry-thumbnail">
<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2024/12/Dual-Stack-PPPoE-on-a-Palo-Alto-Firewall-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy"/> </div>

<h1 class="entry-title">
<a href="https://weberblog.net/dual-stack-pppoe-on-a-palo-alto-firewall/" rel="bookmark">Dual-Stack PPPoE on a Palo Alto Firewall</a>
</h1>

<div class="entry-meta">
<span class="date"><a href="https://weberblog.net/dual-stack-pppoe-on-a-palo-alto-firewall/" title="Permalink to Dual-Stack PPPoE on a Palo Alto Firewall" rel="bookmark"><time class="entry-date" datetime="2024-12-19T15:51:28+01:00">2024-12-19</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/network/internet-access/" rel="category tag">Internet Access</a>, <a href="https://weberblog.net/category/network/ipv6/" rel="category tag">IPv6</a>, <a href="https://weberblog.net/category/vendordeviceos/palo-alto-networks/" rel="category tag">Palo Alto Networks</a></span><span class="tags-links"><a href="https://weberblog.net/tag/dhcpv6-pd/" rel="tag">DHCPv6-PD</a>, <a href="https://weberblog.net/tag/dsl/" rel="tag">DSL</a>, <a href="https://weberblog.net/tag/dual-stack/" rel="tag">Dual-Stack</a>, <a href="https://weberblog.net/tag/palo-alto-networks/" rel="tag">Palo Alto Networks</a>, <a href="https://weberblog.net/tag/pppoe/" rel="tag">PPPoE</a>, <a href="https://weberblog.net/tag/profishark/" rel="tag">ProfiShark</a>, <a href="https://weberblog.net/tag/telekom/" rel="tag">Telekom</a>, <a href="https://weberblog.net/tag/wireshark/" rel="tag">Wireshark</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<p>If you want to establish an Internet connection (that is: IPv6 and IPv4) right away from your firewall through xDSL connections, you need quite some technologies: <strong>PPPoE and PPPoEv6 (PPP IPV6CP) along with DHCPv6-PD</strong>. Fortunately, with PAN-OS 11.0 and 11.1, those missing IPv6 links were finally added by PANW to their Strata firewalls. (<a href="https://weberblog.net/dhcpv6-prefix-delegation-on-palo-altos-ngfw/">I have been awaiting them since 2015!</a>)</p>
<p>So, here it is: Connecting a Palo through an xDSL modem to a residential ISP:</p>
<p> <a href="https://weberblog.net/dual-stack-pppoe-on-a-palo-alto-firewall/#more-13299" class="more-link">Continue reading <span class="screen-reader-text">Dual-Stack PPPoE on a Palo Alto Firewall</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13277" class="post-13277 post type-post status-publish format-standard has-post-thumbnail hentry category-fritzbox category-internet-access tag-draytek tag-dsl tag-firewall tag-fritzbox tag-modem tag-vdsl tag-vigor">
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<img width="604" height="270" src="https://weberblog.net/wp-content/uploads/2024/12/xDSL-Modems-featured-image-604x270.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy"/> </div>

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<a href="https://weberblog.net/xdsl-modems/" rel="bookmark">xDSL-Modems</a>
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<span class="date"><a href="https://weberblog.net/xdsl-modems/" title="Permalink to xDSL-Modems" rel="bookmark"><time class="entry-date" datetime="2024-12-16T11:05:28+01:00">2024-12-16</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/vendordeviceos/fritzbox/" rel="category tag">FRITZ!Box</a>, <a href="https://weberblog.net/category/network/internet-access/" rel="category tag">Internet Access</a></span><span class="tags-links"><a href="https://weberblog.net/tag/draytek/" rel="tag">DrayTek</a>, <a href="https://weberblog.net/tag/dsl/" rel="tag">DSL</a>, <a href="https://weberblog.net/tag/firewall/" rel="tag">Firewall</a>, <a href="https://weberblog.net/tag/fritzbox/" rel="tag">FRITZ!Box</a>, <a href="https://weberblog.net/tag/modem/" rel="tag">Modem</a>, <a href="https://weberblog.net/tag/vdsl/" rel="tag">VDSL</a>, <a href="https://weberblog.net/tag/vigor/" rel="tag">Vigor</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p>Wenn man eine Enterprise-Firewall an einem klassischen DSL-Anschluss verwenden möchte, benötigt man ein extra DSL-Modem. Dies unterscheidet sich von Heimkundenroutern wie der Fritzbox, die immer schon ein DSL-Modem mit eingebaut hat. Back to the roots – so wie damals, als man ein Dreiergespann aus Splitter, Modem und Router hatte – kennt ihr es noch? ;)</p>
<p>In meinem Fall wollte ich eine Palo bzw. Forti an einem Telekom VDSL-Anschluss betreiben. Zwei Varianten habe ich getestet: <strong>Eine zum Modem degradierte Fritzbox (Bastellösung) und ein reines DSL-Modem aus dem Hause DrayTek.</strong> Hier ein paar Notizen und Screenshots:</p>
<p> <a href="https://weberblog.net/xdsl-modems/#more-13277" class="more-link">Continue reading <span class="screen-reader-text">xDSL-Modems</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13244" class="post-13244 post type-post status-publish format-standard has-post-thumbnail hentry category-dns-dnssec tag-ct-artikel tag-conditional-forwarding tag-ddns tag-dns tag-dnssec tag-edns tag-reverse-dns">
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<h1 class="entry-title">
<a href="https://weberblog.net/das-domain-name-system/" rel="bookmark">Das Domain Name System</a>
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<span class="date"><a href="https://weberblog.net/das-domain-name-system/" title="Permalink to Das Domain Name System" rel="bookmark"><time class="entry-date" datetime="2024-12-06T14:24:21+01:00">2024-12-06</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/network/dns-dnssec/" rel="category tag">DNS/DNSSEC</a></span><span class="tags-links"><a href="https://weberblog.net/tag/ct-artikel/" rel="tag">c't Artikel</a>, <a href="https://weberblog.net/tag/conditional-forwarding/" rel="tag">conditional forwarding</a>, <a href="https://weberblog.net/tag/ddns/" rel="tag">DDNS</a>, <a href="https://weberblog.net/tag/dns/" rel="tag">DNS</a>, <a href="https://weberblog.net/tag/dnssec/" rel="tag">DNSSEC</a>, <a href="https://weberblog.net/tag/edns/" rel="tag">EDNS</a>, <a href="https://weberblog.net/tag/reverse-dns/" rel="tag">Reverse DNS</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<p>Kaum ein anderes Element ist so essenziell für das Internet wie das Domain Name System. Ruckelts mal im DNS, reagieren Webseiten und überhaupt alle Internetanwendungen gleich langsamer oder gar nicht. Doch um Fehlerursachen zu ermitteln und zu beseitigen, brauchen Firmen- und Heim-Admins ein weitreichendes Verständnis der Zusammenhänge.</p>
<p> <a href="https://weberblog.net/das-domain-name-system/#more-13244" class="more-link">Continue reading <span class="screen-reader-text">Das Domain Name System</span> <span class="meta-nav">→</span></a></p>
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<article id="post-13228" class="post-13228 post type-post status-publish format-standard has-post-thumbnail hentry category-conference-talks category-dns-dnssec tag-dns tag-dns-cache tag-dnssec tag-dynamic-dns tag-sharkfest tag-ttl tag-wireshark">
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<h1 class="entry-title">
<a href="https://weberblog.net/its-always-dns-sharkfest23-eu/" rel="bookmark">It’s Always DNS! @ SharkFest’23 EU</a>
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<span class="date"><a href="https://weberblog.net/its-always-dns-sharkfest23-eu/" title="Permalink to It’s Always DNS! @ SharkFest’23 EU" rel="bookmark"><time class="entry-date" datetime="2024-11-27T15:54:24+01:00">2024-11-27</time></a></span><span class="categories-links"><a href="https://weberblog.net/category/conference-talks/" rel="category tag">Conference Talks</a>, <a href="https://weberblog.net/category/network/dns-dnssec/" rel="category tag">DNS/DNSSEC</a></span><span class="tags-links"><a href="https://weberblog.net/tag/dns/" rel="tag">DNS</a>, <a href="https://weberblog.net/tag/dns-cache/" rel="tag">DNS Cache</a>, <a href="https://weberblog.net/tag/dnssec/" rel="tag">DNSSEC</a>, <a href="https://weberblog.net/tag/dynamic-dns/" rel="tag">Dynamic DNS</a>, <a href="https://weberblog.net/tag/sharkfest/" rel="tag">SharkFest</a>, <a href="https://weberblog.net/tag/ttl/" rel="tag">TTL</a>, <a href="https://weberblog.net/tag/wireshark/" rel="tag">Wireshark</a></span><span class="author vcard"><a class="url fn n" href="https://weberblog.net/author/weberjoh/" title="View all posts by Johannes Weber" rel="author">Johannes Weber</a></span> </div>
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<div class="entry-content">
<p><a href="https://sharkfest.wireshark.org/retrospective/sfeu/sf23eu/" target="_blank" rel="noopener">This time (2023)</a> at the yearly <a href="https://sharkfest.wireshark.org/" target="_blank" rel="noopener">Wireshark Developer and User Conference</a> in Europe, I gave a talk about DNS. How could it have been any different –> The title simply had to be ‘<strong>It’s Always DNS</strong>‘. 😂</p>
<p>“This session dives deeper into the Domain Name System, covering <strong>recursive vs. iterative DNS queries, resource records types, TTL & caching, DNS errors, a little DNSSEC, flags</strong>, and of course: <strong>Wireshark with its useful display filters, custom columns, colouring rules</strong>, and so on. And we will explore some other tools to analyze and troubleshoot DNS even further.”</p>
<p>You can <strong>watch the whole session</strong> and download the slides. And you can do the six <strong>challenges</strong> at the end of the session as well. (The answers are not in the PDF, but shown in the video.)</p>
<p> <a href="https://weberblog.net/its-always-dns-sharkfest23-eu/#more-13228" class="more-link">Continue reading <span class="screen-reader-text">It’s Always DNS! @ SharkFest’23 EU</span> <span class="meta-nav">→</span></a></p>
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