Re: physical vs. logical network interfaces

stf a écrit :

On tcpdump level they are on "eth1", while on iptables level it is already "eth0".

Oops I skipped this part, replying now.
Both tcpdump and netfilter/iptables see the packets coming from the interface they actually come from, i.e. eth1.

The iptables ruleset may contain rules filtering source|destination addresses that don't match the outgoing|incoming interface, such as :

iptables -A INPUT -i eth1 -d ! $eth1_addr -j DROP
iptables -A OUTPUT -o eth1 -s ! $eth1_addr -j DROP
.

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