NAT Linux

Linux IP Tables

IP Tables is used for packet filtering and NAT/PAT translation on several Linux distributions including

• Ubunto
• Redhat
• Centos

Basic NAT example using IP Tables

In the example below the internal network 192.168.1.0/24 is Source Natted (SNAT) to the external IP Address 83.90.47.30. Source nat also makes port translations. So the example uses NAT/PAT, and would be sufficient as a NAT/PAT solution for a private network.

iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -d 0.0.0.0/0 -j SNAT --to 83.90.47.30

use the command iptables -L -t nat to see the rule in the IPTABLES chains.

[root@bkshost etc]# iptables -L -t nat
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination
SNAT       all  --  192.168.1.0/24        anywhere           to:83.90.47.30

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Webserver located on internal network

To redirect WEB traffic originating from the outside to a WEB-server on the inside you would use a rule as showed below.