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From my reading of the libvirt documentation and the examples here libvirt uses a Linux bridge to provide routing between VM's on the same host. It also starts a dnsmasq process attached to the bridge which supplies DHCP addresses to the VMs. I'm wondering if there anyone could point me to good articles or example on routing between VM's across hosts ideally without having to split an IP range across multiple DHCP servers on each box. Unless my reading of the docs is incorrect (why it may well be) static IP's for VM's seems to involve a DHCP server hackery. KVM/libvirt: How to configure static guest IP addresses on the virtualisation host

user1325094
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  • Such recommendations are off topic here. If you have a concrete problem, feel free to ask about it (with enough information about your environment). – Gerald Schneider Feb 03 '22 at 14:58
  • libvirt uses a Linux bridge to connect multiple VMs to same network is the correct term. Linux bridge does not provide routing or forwarding of IP packets between IP subnets. – Tero Kilkanen Feb 03 '22 at 15:31
  • Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Feb 16 '22 at 15:36

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One straightforward way is to connect all the VMs to a bridge, where one member is the physical interface on the host.

That way VMs are hosts in the Ethernet network. Then these hosts use the DHCP server that is set up for the physical network.

This approach has certain limit on scalability though.

Tero Kilkanen
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