Re: bin/39520: IPNAT fails to consistently handle FTP sessions

[Peter Eisch <peter%boku.net@localhost>]

The following reply was made to PR bin/39520; it has been noted by GNATS.

From: Peter Eisch <peter%boku.net@localhost>
To: <gnats-bugs%NetBSD.org@localhost>
Cc: 
Subject: Re: bin/39520: IPNAT fails to consistently handle FTP sessions
Date: Tue, 16 Sep 2008 13:07:22 -0500

 More information:
 
 FTP totally fails to connect to the server if the client is NAT'd and ToE
 functions are enabled on the interface doing NAT.
 
 
 +--------+    +-------+    +--------+
 | client |--->| nbrtr |--->| server |
 +--------+    +------NAT   +--------+
 
 With ToE enabled, the interface near the server sees the SYN-ACK from the
 server but immediately returns a RST.  Simply disabling ToE with -tcp4sum
 and no other changes the client connects and works with the server.
 
 I'm still working on more information for the initial report.  Changing ToE
 did not affect the sporadic nature of the problem.