ipchains, iptables and port-forwarding

[Cyrix]

Hi everyone !

I'm new to Gentoo Linux (as most people I think cause it's pretty young) and have some questions concerning ipchains and iptables.

I want to migrate from a Debian 2.2 System which has a well-planned good configured ipchains firewall. I compiled ipchains as well as iptables as modules into my 2.4.19-gentoo-r7 kernel. My old firewall started without major problems (only some sysctl-options are obsolete) but some Ports which were forwarded using ipmasqadm could not be forwarded because ipmasqadm could not be found. An emerge ipmasqadm failed - no matching package found.
Is there a way to emerge it ? maybe under a different name ?
Or is there any other way to forward ports ?

This is only a temporary solution. I want to migrate the firewall to iptables, but only as well-planned as my ipchains firewall. Can anyone recommend tutorials and detailed descriptions to plan and write a good and secure iptables firewall ? How can I forward ports with iptables ?

Thanks in advance !
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