I think you have to install the H.323 module in order to establish voice over IP communications.

See here: http://roeder.goe.net/~koepi/newnat.html

And then you must to set your firewalls rules according to RTP ports.

Greetings

Alejandro

----- Original Message -----

From: MagicWind

To: netfilter@lists.netfilter.org

Sent: Wednesday, August 04, 2004 12:09 PM

Subject: How can I configure my firewall to access voice chat with MSN messenger 6.2?

I have a linux server which is configured as a router connecting my internal network and the internet. using the following iptables rules:

iptables -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT
iptables -A FORWARD -j LOG
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

where eth0 is the netword adapter linking to the internet and the eth1 is the adapter linking to the internal network.

It seems the network works quite well, except for the voice connection of MSN messenger 6.2. I can't either initial a voice chat or accept a voice chat.

I've got absolutely no idea how to make it work. Any ideas?