How to add two interfaces to KVM VM acting like a loopback

stan

2/6/24, 8:07 PM

I have KVM machine with network interface (say eth0) attached to virbr0, I use it to ssh into the vm.

I would like to add two more ethernet interfaces (say eth1 and eth2) and "bridge it on the other side" (meaning on the host), so for the VM it looks like two ethernet cards connected with a wire.

I tried adding two more networks with virsh:

<network>
    <name>network0</name>   # and same for network1
    <forward mode='bridge'/>
    <bridge name='br0'/>
</network>

with bridge (on host):

ip link add name br0 type bridge
ip link set dev br0 up

but it seems to not pass the traffic (on vm):

ip addr add 10.0.0.1/24 dev eth1
ip link set dev eth1 up
ping -I eth1 10.0.0.2

and:

ip link set dev eth2 up
tcpdump -i eth2

Gives no output. What am I missing?

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