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Goodmorning, I have a similar problem.  I have following architecture:2 PC (PC A and PC B).PC A has 2 Ethernet interfaces (A_eth0 and A_eth1).PC B has 2 Ethernet interfaces (B_eth0 and B_eth1). A_eth0 is connected through a wire with B_eth0 (in the middle there is a Switch: SWT_0)A_eth1 is connected through a wire with B_eth1 (in the middle there is a Switch: SWT_1) IP addresses used:A_eth0: 192.168.30.1A_eth1: 192.168.30.2B_eth0: 192.168.30.3B_eth1: 192.168.30.4 netmask: 255.255.255.0 SWT_0 and SWT_1 are 2 different switch (in order to realize a physical separation). Operating system on both machine: LINUX UBUNTU 9.04 Aim of my test:- realize communication between A_eth0 and B_eth0 - realize communication between A_eth1 and B_eth1- A_eth0 and B_eth1 HAVEN'T TO communicate- A_eth1 and B_eth0 HAVEN'T TO communicateProblem I have:- IF I remove wire connection between A_eth0 and B_eth0 THEN B_eth0 is achieved by PC A (passing through the wrong interface B_eth1)In this case a non-desired communication between A_eth0 and B_eth1 is established.- IF I remove wire connection between A_eth1 and B_eth1 THEN B_eth1 is achieved by PC A (passing through the wrong interface B_eth0) In this case a non-desired communication between A_eth1 and B_eth0 is established. I have realized following steps on both machinesve tried:sysctl -w net.ipv4.conf.all.arp_filter=10sysctl -w net.ipv4.conf.all.arp_announce=2sysctl -w net.ipv4.conf.all.arp_ignore=1 /etc/init.d/networking restart orsysctl -w net.ipv4.conf.all.arp_filterarp_announce=02sysctl -w net.ipv4.conf.alldefault.arp_announcerp_filter=2sysctl -w net.ipv4.conf.all.arp_ignorerp_filter=12 /etc/init.d/networking restart In any cases the problem is not solved. Thanks and it seems to work for your attentionme.RegardsPaoloDaryl Radivojevic