H.323 through a Netfilter (Linux 2.4) firewall
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To communicate using a tool like Microsoft NetMeeting or GnomeMeeting through a Linux (kernel 2.4.x-based) firewall, you have to redirect some ports to one IP address in the inside network, otherwise, it won't work.
Here is a little script meant to achieve exactly that:
#!/bin/sh # Script to redirect H.323 trafic to one specific IP behind the firewall IPTABLES=/sbin/iptables OUT_DEV=ppp0 IN_HOST=192.168.11.33 TCP_PORT_RANGE=30000:30010 UDP_PORT_RANGE=5000:5003 TCP_LISTENING_PORT=1720 #$IPTABLES -