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Re: kern/51753: tcp SACK causes SSH disconnects

The following reply was made to PR kern/51753; it has been noted by GNATS.

From: "John D. Baker" <>
Subject: Re: kern/51753: tcp SACK causes SSH disconnects
Date: Fri, 30 Dec 2016 09:20:52 -0600 (CST)

 This looks a lot like something I was seeing when working on some remote
 systems.  It was most likely to occur with high output traffic (such as
 when running an update build of the system).
 It also seemed to be affected by one or more intervening routers between
 the client and server.  A "direct" connection to the problem machine
 would be unstable but SSH-ing to another host first and then connecting
 to the problem system would be rock solid.  That "other host" could be
 another machine on the same LAN as the problem machine, also running
 NetBSD-7/amd64, or another remote machine (not on same LAN) running
 The problem machine was later replaced and the behavior has not been
 observed on the replacement.  Said problem machine is now in my possession
 and did not exhibit the behavior when connected to my LAN.
 There was a thread about this in one of the other mailing lists some
 time back (either current-users@ or netbsd-users@), but I haven't been
 able to locate it so far.
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