[CentOS] Inquiry:How to enable "NAT" on CentOS 5 ?

Barry Brimer lists at brimer.org
Mon Nov 23 07:54:40 UTC 2009

> Dear All
> On my CentOS 5 , I installed the Asterisk 1.4.13 and DECT application
> software and then when I want to try for "NAT" I issue as the followings :
> #iptables -t nat -A POSTROUTING -s -o eth0 -j MASQUERADE
> But it didn't get through . So I checked if the "NAT" is enabled on
> my CentOS server , as the followings :
> #echo "1" > /proc/sys/net/ipv4/ip_forward
> But still I cannot try for "NAT" . Can you please let me know which other
> setings maybe influenced and need to be checked for enabling the "NAT" ?

You have your outgoing traffic NATed .. but you need a PREROUTING rule to 
forward the traffic to your Asterisk server.

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