[SOLVED] CentOS Gateway. Packets with local IP are on the WAN interface.

lesh · 10-06-2011, 01:39 AM

Hello guys!
Throw our billing (using libpcap) I see than on external interface (eth1) on our gateway there are outbound packets with source IP from local network. This is the iptables rule for SNAT:

Code:

-t NAT -A POSTROUTING -o eth1 -j SNAT --to-source external-IP

Now I use tcpdump to shiff this packets to show it's content. But I'm confused.

eSelix · 10-06-2011, 04:36 AM

Show routing table and content of that packets (without data).

lesh · 10-06-2011, 04:37 AM

Well, I've sniffed this packets and its MAC-s. It's not outgoing but incoming packets from my ISP's gateway. That's strange, but the problem has gone =)