On Wed, 2002-11-06 at 03:47, Thierry ITTY wrote: > Hello > > I have a linux box (rh 73 out of the box on a P200mmx and 2 accton nics) > with iptables (1.2.3-1) .... > > OK, now here's the problem I get : > when the box is in router mode, it answers to ARP requests asking for > 192.168.1.1 coming on NIC B (sent all from the B side PCs in their normal > network operation process) with NIC B's mac address. this is fine > BUT, it also answers to ARP requests asking for 192.168.1.1 coming on NIC A > (sent all from the A side PCs) with NIC A's mac address. and this is of > course wrong, because A side PCs then send their routed traffic to the > linux box (which obviously doesn't handle it) instead of sending it to the > true router. > > what causes this behaviour (responding on the A side to arp requests which > it should not answer to) and how can I cure it ? > > tia ... I have heard of this problem, but never had to deal with it myself and I don't have time to test it for you, but I have heard that these kernel settings will solve the problem. Not sure this will help, but I think it will: http://www.linux-vs.org/~julian/bridging.txt There are dynamically configurable linux kernel parameters like: /proc/sys/net/ipv4/conf/all/proxy_arp and /proc/sys/net/ipv4/conf/all/arp_filter That might help.
