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

[yue]

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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