ipchains vs ipportfw

[Jay Tarbox]

Ok, got the new kernel with this great new ipchains in it.  How do you get
the functionality of ipportfw with it?  I have a web server/mail server on
the inside of this firewall/ip masq box.  I want web,dns and mail requests
to go to the server inside.  Thats all.  I can do it easily with the old
ipportfw, but this ipchains is really screwing me up.  IMHO the How-to on
the thing and the man page really suck.  Any help out there for me?