networking woes w/ kernel 2.4

From: Dave Ahn (ahn@vec.wfubmc.edu)
Date: Thu Oct 19 2000 - 16:14:45 EST

Hello,

I have a network setup that works perfectly fine under Linux 2.2.17 (and
other OS's) but not under 2.4.0-test9. Here is the setup:

                  NAT/FW
           router | router
host A <----X------>W--------Y------> host B
1.1.1.1 ^--------Z------< 2.2.2.2
           [1.1.1.1 <-> 1.1.9.9]

Host A is behind a NAT firewall and has address 1.1.1.1
Host B on the other side has an asymmetric route to/from host A.
The FW translates A's 1.1.1.1 address to/from 1.1.9.9.
The FW allows unrestricted access from the outside to host A's SMTP port.

I have no problems with connections initiated by host A to host B.
Telnet, SMTP, ssh, etc all work fine, so the routing is set up properly.

I can ping host A from host B, as the FW rules allow it.
I cannot, however, connect to host A's SMTP port from host B.

The problem is definitely with host B and with Linux 2.4.0-test9. The same
host running 2.2.17 works fine.

Any ideas what's going on? 

-- 
Dave Ahn | ahn@vec.wfubmc.edu
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