Hi, I've a passive monitor setup with 3 network interfaces. eth2 is the management (normal) interface while eth0 and eth1 are my monitoring interfaces which never transmit.
-----+-----+-------- | | eth0 eth1
so eth0 monitors the traffic one way on the link and vice versa for eth1 (we're using a netoptics tap).
Anyway my question is I would like to pass all traffic received on eth0 and eth1 into netfilter. I thought by placing my rules in the PREROUTING chain of the mangle table would work, since this happens before any routing decision is made. But the packets are never received by netfilter :-(
The packets are entering the box because you can see/filter them using iptraf.
#iptables -t mangle -L PREROUTING -v
Chain PREROUTING (policy ACCEPT 189K packets, 61M bytes)
pkts bytes target prot opt in out source destination
0 0 icmp -- eth0 any anywhere anywhere
0 0 icmp -- eth1 any anywhere anywhere
thanks, Pádraig.
