Enable SNAT with IPTABLES on FC5
 

I have this setup on my FC5 machine.

WAN Interface (eth1)
IP: 10.12.69.3
Mask: 255.255.255.0
GW: 10.12.69.2


LAN Interface (eth0)
IP: 192.168.1.3
Mask: 255.255.255.0

I want to enable NAT with iptables on this machine. And to host service on port 25 and 110 where internet users can access the service.
I have enabled port forwarding on my router to 192.168.1.3

I greatly appreciate if anyone could help me with this.

Thanks in advance.

Try this iptables rule to enable NAT for 192.168.1.0 network:

iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

make sure that 'nat' table is flushed (iptables -t nat -L) or flush it by command 'iptables -t nat -F'.

After NAT is enabled just put 192.168.1.3 as default gateway entry at 192.168.1.0 network subscribers' PCs.

Good luck!

Does not your router already support masquerading if you're using privates on that email box?

I want to create SNAT. Not masquerade.

iptables -t nat -a POSTROUTING -o $WAN -j SNAT --to $WANIP

However, I suspect if your router is a masquerading to your private addressed server you've still more work ahead of yourself.

What else do i need to do?