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From: Mills@LOUIE.UDEL.EDU
Newsgroups: mod.protocols.tcp-ip
Subject: Re:  Looking for DDN/X.25 to TCP/IP router
Message-ID: <8701222335.a017242@Huey.UDEL.EDU>
Date: Thu, 22-Jan-87 23:35:43 EST
Article-I.D.: Huey.8701222335.a017242
Posted: Thu Jan 22 23:35:43 1987
Date-Received: Fri, 23-Jan-87 21:30:42 EST
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Milo,

Yes, some measurements have been made on gateways running X.25 to many
PSNs: the scatter diagrams I sent around a month or so ago. They raised
the suspicion, later confirmed, that something was amiss in the gateway
or PSN, not just bad protocol. Mike Petry at U Maryland subsequently
found a bug in a 4.3bsd driver, which gave much joy when fixed. Something
is apparently still wrong with the Ultirx driver, which was coded by
ACC for their 5250 interface.

Like you, I have real problems with the current X.25 design parameters
in the PSNs, but experience with HDH and ECUs suggests realistic level-3
parameters (big packet sizes and bigger windows) should result in performance
not worse than either HDH or ECUs with the same line speeds.

Dave