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> > Did the ip_tables.o module work at all?
> No, it did not. Insmod told me that the device was busy. I even tried
> deleting the ipchains binaries because I read you can't run ipchains
> and iptables at the same time.

Apparently something else is missing here.  Some quick web research 
suggests you might need something related to nat, whatever that is.
Or you have inserted ipchains and then also ip_tables and you cannot have 
both at once.

> As far as I can gather, ipchains is unable to do any sort of port
> forwarding - in other words, send any packets that arrive at a
> specific port on the WAN side to a given IP on the LAN side. Also, the
> tool that seems to be used for this sort of thing, "ipmasqadm portfw"
> doesn't seem to be working, I get the following errors when trying
> "ipmasqadm portfw -l":


I just searched on 'ipchains' and "port forwarding" and the first hit is:
Port Forwarding with Iphains.  An in-depth tutorial.......
Next hit (using alltheweb) is about port forwarding with  Ipmasqadmin.
Lots more hits.  Keep trying with ipchains.  You might need additional 
modules.

Do you need ipfwadmin.o?  I can compile that but please make a list of all 
possibly needed modules so I can do them all at once.
CONFIG_IP_NF_* - there are LOTS of these (44?) specific to hardware (?)
CONFIG_IP6_NF*  still more of these

> portfw: setsockopt failed: Invalid argument
> Could not open "/proc/net/ip_masq/portfw"
> Could not open "/proc/net/ip_portfw"
> Check if you have enabled portforwarding.

> There is no such directory as /proc/net/ip_masq, and no file at
> /proc/net/ip_portfw. I'm not sure where I should check for enabled
> portforwarding. I couldn't find anything at slackware - but then
> again, I might be looking for the wrong thing.

Probably you need more modules (not just ipchains in the kernel).

Sindi