finding firewall name installed ?

[Radar_mX]

my brother has computer on ubuntu 9.04 we want to forward/open a port throw firewall

so I use vnc to connect throw the firewall

but I don't know what firewall he has I think it is not iptables because

when I type "service iptables status" it says "not recoginzed"

[Radar_mX]

problem solved

iptables -I FORWARD -p tcp --dport [port number] -j ACCEPT