Ati Sharma

Bridged networking with virtd and nixos

01 Dec 2022

Bridged networking in virtd

This gives each vm its own IP without involving a separate subnet / IP range.

nix config

networking.bridges.bridge0.interfaces = [ "bond0" ];
networking.interfaces.bridge0 = {
    useDHCP = false;
    ipv4.addresses = [ {
        "address" = "192.168.1.116";
        "prefixLength" = 24;
    }];
};

virsh network

Create the following file, bridged.xml.

<network>
  <name>bridged</name>
  <uuid>00000000-0000-0000-0000-000000000000</uuid>
  <forward mode='bridge'/>
  <bridge name='bridge0'/>
</network>

Then define the network and connect it to the system

virsh --connect qemu:///system net-define bridged.xml
virsh net-autostart bridged

References

NixOS: Headless Home Assistant VM

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