[CentOS] PREROUTING - DNAT with iptables for an ASTERISK BOX

John Summerfield debian at herakles.homelinux.org
Wed Mar 7 13:47:55 UTC 2007

Indunil Jayasooriya wrote:
> Hi,
> I am running a ASTERISK BOX behind a firewall. It is at DMZ .
> Now I want to connect to my ASTERISK BOX from Internet. So I want to DNAT.
> How can I do it?
> Pls assume that ip address that connects to Internet on firewall is
> is attached to eth0.
> Then, What is the rule (PREROUTING) for it? What is the port to DNAT?
> I think udp 5060. So I have added below 2 rules . But it does not work at
> all.
> iptables -t nat -A PREROUTING -p udp -i eth0 -d --dport 5060 -j 
> --to-destination
> iptables -A FORWARD -p udp -d --dport 5060 -j ACCEPT
> Can you help me to solve this issue?

With all the problems you're having with iptables, I really think you 
should skip round the issue and install shorewall.

The docs on the website outline how to set up several more-or-less 
standard scenarious, and most users will find theirs similar to one of 



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