[newbie] Open TCP and UDP ports

[Mario Descalzi]

Hello, my name is Mario Descalzi amd am a programmer acting as system administrator; if your advise is to "ask your system adm." that would be me again. Have Linux Mandrake 7.0 with two ethernet cards one (192.168.1.1) for LAN and the other (www address); also have a Voice over IP (Planet VIP-400) device on my LAN (192.168.1.160). My counter part, a non Linux person, asked me to open the tcp 1720 port and udp ports 30000 to 31000, also redirect all trafic on these ports to LAN 192.168.1.160. My installation does not have iptables only ipchains. Could any one comment how coul I address this request?   Thanks.   Mario.