I need enlightenment with regards to high ports. Somebody taught me how to use SecureWay Firewall gui admin tool or the fwconfig. I asked the guy if the high ports are open and he told me that it was close. He also showed me how to create a connection using a port that belonged to the high ports. Example, he added 1526 which is a port of informix server. Now I'm getting a bit confused with ipchains in linux and secureway firewall approaches. Because in linux, all high ports are opened. And if you want to block a highport, then you will have to add an ipchain REJECT rule.
It looks that the approach of secureway firewall 4.1 in aix is ok. Deny everything, allow only needed traffic. I guess, I am being confused by ipmasquerading in linux which is different in secureway firewall which is NAT.
Enlighten me please.
Thanks.
Ronneil
