topic Re: Natting on Linux box in Operating System - Linux

Natting on Linux box

varian_1 — Mon, 12 Dec 2005 06:37:37 GMT

Hi,

Requirement :
url on the IP address 192.168.152.113 should be able to access using 172.26.12.112 IP address by the users from 192.168.31.x series network.

Plan : Setup of Linux server which will Nat IP address of 192.168.152.113 to 172.26.12.112

Can some body tell me what is the basic requirement for the same.

Regards

Walter Crasto

Re: Natting on Linux box

Bill Thorsteinson — Mon, 12 Dec 2005 11:12:08 GMT

I would install shorewall and setup
a DNAT rule for this.

If you want to build your own rules check
the documentation at the Linux Documentation
Project http://tldp.org. There is a
document on configuring NAT.

Re: Natting on Linux box

Alexander Chuzhoy — Mon, 12 Dec 2005 12:06:16 GMT

you can use iptables for this:

first:
echo 1 > /proc/sys/net/ipv4/ip_forward

then:
iptables -t nat -A PREROUTING -s 192.168.31.0/24 -j DNAT --to-destination 192.168.152.113

and:
iptables -t nat -A POSTROUTING -j MASQUERADE

that's it

Re: Natting on Linux box

Thomas Bianco — Tue, 13 Dec 2005 10:40:08 GMT

consider using a specialized firewall distribution, like monowall or smoothwall. these are prepackaged with everything needed, are simple to configure and maintain, and include firewalling featrues should you need them.