VLANs bits
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<section><h2>Layers!</h2>
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<p class="fragment">Like an onion!</p>
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<p class="fragment">That 7 layer thing from the OSI</p>
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<p class="fragment">Ethernet -> IP -> ICMP/TCP/UDP</p>
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<p class="fragment">Administrative overlays</p>
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<p class="fragment">VPNs and Tunnels</p>
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<aside class="notes">
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<p>or a parfait</p>
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<p>which you can mostly ignore, as what we have doesn't conform to it. But it does provide a good framework for assisting understanding</p>
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<p>which you can mostly ignore, as what we generally use doesn't conform to it. But it does provide a good framework for assisting understanding</p>
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<p>Like firewalls, web-proxies/SSL MITM, But also access rights etc</p>
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</section>
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<p class="fragment">For the purposes of this talk, we can ignore a lot of complexity</p>
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</section>
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<section><h2>An easy one</h2>
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<section><h2>An easy one!</h2>
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<p>VLANS</p>
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<p class="fragment">Ethernet layer</p>
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<p class="fragment">Designed to limit broadcast storms</p>
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<p class="fragment">Can also separate IP networks on the same Ethernet</p>
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<p class="fragment">Tagged and Untagged or Default</p>
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<aside class="notes">
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<p>beware of
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<p>beware of strange implementations, windows seems to take Router Advertisements from all vlans, regardless of tag</p>
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</section>
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<section><h2>VLANs in linux</h2>
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<p>Are pretty easy!</p>
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<pre class="fragment">code data-trim data-noescape>
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<pre class="fragment"><code data-trim data-noescape>
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ip link add link enp0s2 name enp0s2.2501 vlan id 2501
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ip -6 addr add 2001:db8:2501::10/64 dev enp0s2.2501
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ip link set dev enp0s2.2501 up
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</pre>
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</section>
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<section><h2>VLANs in linux</h2>
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<p>Various different methods of making it go in different distributions</p>
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<pre class="fragment"><code data-trim data-noescape>
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<section><h2>What even is a router?</h2>
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<p class="fragment">Two or more interfaces</p>
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