Virtual interfaces

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Hi,
after spending some time with iptables and linux virtual interfaces, I've 
decided to ask.

I have a Linux BOX acting as a router among different LANs. I'm doing some 
filtering (only ssh traffic coming from a certain MAC addrress can go from 
one LAN to another, an so on): 

iptables -t filter -P FORWARD DROP
iptables -A FORWARD -i eth0 -s 192.168.0.0/24 -p TCP -m mac --mac-source 
$whiskey_MAC -d 192.168.10.0/24 --dport 22 -j ACCEPT

With physical interfaces only, all works well. When a try to filter traffic 
between 2 LANs attached to the same physical interface but with 2 different 
virtual IPs, it starts messing. Nothing works, I can't even log packets.

Is that a known bug? Am I just misunderstanding?
Please help.
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Dott. Francesco Chicchiriccò
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