IPX Filtering, Blocking with linux

NETWARE SRVR ----LINUX -----NETWARE SRVR
(A)--------------IPFWADM,IPX-------B

We have IPFWADM set up in a way that users on side B can
use all of the network resources on side A.  But Side A
cannot see side B at all.
We would like to be able to do the same with IPX.  Somehow be able to filter it, so that users on side B would be able to see all servers and use resources on side A but side A would not be able to see anything on side B.  

Can someone explain how to set this up in linux, what software to use etc.

Thanks
***Points will be increased if this turns out to be a hard
question or if somebody requests it
mark21Asked:
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mark21Author Commented:
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mark21Author Commented:
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mark21Author Commented:
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jantypasCommented:
Unfortunately, I know of no package on the Linux that performs IPX/SPX fitler tasks -- plenty that do IP but not IPX.  Remember, IP protocol knowledge was plublic knowledge, IPX required $$$ to get it...

Hate to say it, but $1000 will buy a Cisco 2501 that will exactly what you want and it's rock solid.

If you were adventurous, you could MODIFY the ip filter code to do it... you'd have to do something like this:

- Using the bpf-style fitlers in the kernel, have each filter watch for an IPX SAP.  If it finds it, check against a clist in the kernel filled with "allowed" stations.  If it finds a match, pass the frame, otherwise drop it.
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