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<meta name="twitter:description" content="#!/bin/sh # Last Edited: 2020-05-18 # From: https://www.furorteutonicus.eu/2013/08/04/enabling-host-guest-networking-with-kvm-macvlan-and-macvtap/ # Let host and guests talk to each other over macvlan. # Configures a macvlan interface on the hypervisor. # Run this on the hypervisor (e.g. in /etc/rc.local) # Made for IPv4; need modification for IPv6. # Meant for a simple network setup with only eth0, # and a static (manual) ip config. # Evert Mouw, 2013. Slightly modified in 2020. HWLINK=enp34s0 MACVLN=macvlan0 TESTHOST=www."/>
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<meta property="og:description" content="#!/bin/sh # Last Edited: 2020-05-18 # From: https://www.furorteutonicus.eu/2013/08/04/enabling-host-guest-networking-with-kvm-macvlan-and-macvtap/ # Let host and guests talk to each other over macvlan. # Configures a macvlan interface on the hypervisor. # Run this on the hypervisor (e.g. in /etc/rc.local) # Made for IPv4; need modification for IPv6. # Meant for a simple network setup with only eth0, # and a static (manual) ip config. # Evert Mouw, 2013. Slightly modified in 2020. HWLINK=enp34s0 MACVLN=macvlan0 TESTHOST=www." />
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<h1 class ="post-title">Windows 10 KVM Single-GPU Passthrough - macvlan Script</h1>
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May 18, 2020
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<div class="highlight"><pre style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:1;-o-tab-size:1;tab-size:1"><code class="language-bash" data-lang="bash"><span style="color:#ff79c6">#!/bin/sh
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</span><span style="color:#ff79c6"></span><span style="color:#6272a4"># Last Edited: 2020-05-18</span>
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<span style="color:#6272a4"># From: https://www.furorteutonicus.eu/2013/08/04/enabling-host-guest-networking-with-kvm-macvlan-and-macvtap/</span>
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<span style="color:#6272a4"># Let host and guests talk to each other over macvlan.</span>
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<span style="color:#6272a4"># Configures a macvlan interface on the hypervisor.</span>
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<span style="color:#6272a4"># Run this on the hypervisor (e.g. in /etc/rc.local)</span>
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<span style="color:#6272a4"># Made for IPv4; need modification for IPv6.</span>
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<span style="color:#6272a4"># Meant for a simple network setup with only eth0,</span>
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<span style="color:#6272a4"># and a static (manual) ip config.</span>
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<span style="color:#6272a4"># Evert Mouw, 2013. Slightly modified in 2020.</span>
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<span style="color:#8be9fd;font-style:italic">HWLINK</span><span style="color:#ff79c6">=</span>enp34s0
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<span style="color:#8be9fd;font-style:italic">MACVLN</span><span style="color:#ff79c6">=</span>macvlan0
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<span style="color:#8be9fd;font-style:italic">TESTHOST</span><span style="color:#ff79c6">=</span>www.google.com
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<span style="color:#6272a4"># ------------</span>
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<span style="color:#6272a4"># test if interface already exists</span>
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<span style="color:#6272a4"># ------------</span>
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<span style="color:#ff79c6">if</span> ip link show | grep <span style="color:#f1fa8c">"</span><span style="color:#8be9fd;font-style:italic">$MACVLN</span><span style="color:#f1fa8c">@</span><span style="color:#8be9fd;font-style:italic">$HWLINK</span><span style="color:#f1fa8c">"</span> > /dev/null
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<span style="color:#ff79c6">then</span>
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<span style="color:#8be9fd;font-style:italic">echo</span> <span style="color:#f1fa8c">"Link </span><span style="color:#8be9fd;font-style:italic">$MACVLN</span><span style="color:#f1fa8c"> already exists on </span><span style="color:#8be9fd;font-style:italic">$HWLINK</span><span style="color:#f1fa8c">."</span>
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<span style="color:#8be9fd;font-style:italic">exit</span>
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<span style="color:#ff79c6">fi</span>
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<span style="color:#6272a4"># ------------</span>
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<span style="color:#6272a4"># wait for network availability</span>
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<span style="color:#6272a4"># ------------</span>
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<span style="color:#ff79c6">while</span> ! ping -q -c <span style="color:#bd93f9">1</span> <span style="color:#8be9fd;font-style:italic">$TESTHOST</span> > /dev/null
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<span style="color:#ff79c6">do</span>
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<span style="color:#8be9fd;font-style:italic">echo</span> <span style="color:#f1fa8c">"</span><span style="color:#8be9fd;font-style:italic">$0</span><span style="color:#f1fa8c">: Cannot ping </span><span style="color:#8be9fd;font-style:italic">$TESTHOST</span><span style="color:#f1fa8c">, waiting another 5 seconds."</span>
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sleep <span style="color:#bd93f9">5</span>
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<span style="color:#ff79c6">done</span>
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<span style="color:#6272a4"># ------------</span>
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<span style="color:#6272a4"># get network config</span>
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<span style="color:#6272a4"># ------------</span>
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<span style="color:#8be9fd;font-style:italic">IP</span><span style="color:#ff79c6">=</span><span style="color:#ff79c6">$(</span>ip address show dev <span style="color:#8be9fd;font-style:italic">$HWLINK</span> | grep <span style="color:#f1fa8c">"inet "</span> | awk <span style="color:#f1fa8c">'{print $2}'</span><span style="color:#ff79c6">)</span>
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<span style="color:#8be9fd;font-style:italic">NETWORK</span><span style="color:#ff79c6">=</span><span style="color:#ff79c6">$(</span>ip -o route | grep <span style="color:#8be9fd;font-style:italic">$HWLINK</span> | grep -v default | awk <span style="color:#f1fa8c">'{print $1}'</span><span style="color:#ff79c6">)</span>
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<span style="color:#8be9fd;font-style:italic">GATEWAY</span><span style="color:#ff79c6">=</span><span style="color:#ff79c6">$(</span>ip -o route | grep default | awk <span style="color:#f1fa8c">'{print $3}'</span><span style="color:#ff79c6">)</span>
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<span style="color:#6272a4"># ------------</span>
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<span style="color:#6272a4"># setting up $MACVLN interface</span>
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<span style="color:#6272a4"># ------------</span>
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ip link add <span style="color:#8be9fd;font-style:italic">$MACVLN</span> link <span style="color:#8be9fd;font-style:italic">$HWLINK</span> <span style="color:#8be9fd;font-style:italic">type</span> macvlan mode bridge
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ip address add <span style="color:#8be9fd;font-style:italic">$IP</span> dev <span style="color:#8be9fd;font-style:italic">$MACVLN</span>
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ip link <span style="color:#8be9fd;font-style:italic">set</span> dev <span style="color:#8be9fd;font-style:italic">$MACVLN</span> up
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<span style="color:#6272a4"># ------------</span>
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<span style="color:#6272a4"># routing table</span>
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<span style="color:#6272a4"># ------------</span>
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<span style="color:#6272a4"># empty routes</span>
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ip route flush dev <span style="color:#8be9fd;font-style:italic">$HWLINK</span>
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ip route flush dev <span style="color:#8be9fd;font-style:italic">$MACVLN</span>
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<span style="color:#6272a4"># add routes</span>
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ip route add <span style="color:#8be9fd;font-style:italic">$NETWORK</span> dev <span style="color:#8be9fd;font-style:italic">$MACVLN</span> metric <span style="color:#bd93f9">0</span>
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<span style="color:#6272a4"># add the default gateway</span>
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ip route add default via <span style="color:#8be9fd;font-style:italic">$GATEWAY</span></code></pre></div>
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