when define NAT network, assign what kind of forward dev is better

[yue <libvirt@xxxxxxx>]

hi all:

in my case, my physical machine has one ethernet, i want to use both bridge and nat network.

i create a bridge outbr0(addif eth0),  when creating NAT network, there are 3 options for forward-dev

1.<forward mode="nat" />

2.<forward mode="nat" dev="outbr0"/>

3.<forward mode="nat" dev="eth0"/>

i do not know which one is the best?

thanks

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