NAT Issue

Red Baron
Mon, 01 Mar 2010 22:54:11 -0000

shorewall-lite version 4.4.6
Debian Lenny -  2.6.26-2-686

I have a large network of public IPS ( 1.1.1.128/25 )

I have broken this up into several smaller subnets. I have a few servers
that I want to NAT translate from my gateway server to a public IP on
VLAN350. which is subnet 1.1.1.192 / 27.

My gateway server has the following interfaces

eth0 - 1.1.1.149 /28
eth1 - 172.16.1.0 /24
vlan350 - 1.1.1.193 /27


I have this entry in the nat configuration file:
#EXTERNAL    INTERFACE    INTERNAL    ALL        LOCAL
1.1.1.198    vlan350    172.16.1.23    no    no
#LAST LINE -- ADD YOUR ENTRIES ABOVE THIS LINE -- DO NOT REMOVE

but when the host 172.16.1.23 pings the internet, the IP is masquerarded as
1.1.1.149, not 1.1.1.198

>From the gateway, I can do the following

ping www.google.com -I 1.1.1.198

and I do get replies, and tcpdump on the gateway verifies that the IP being
used is correct, so I know the routes are in place.


Any suggestions as to what I might be doing wrong?

The dump file is over 50k even after sending.