Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!bu-cs!budd
From: budd@bu-cs.BU.EDU (Philip Budne)
Newsgroups: comp.protocols.appletalk
Subject: Re: SMTP mail to Mac's
Summary: MacTCP sends bad MSS for localtalk?
Keywords: mactcp localtalk tcp mss
Message-ID: <37995@bu-cs.BU.EDU>
Date: 12 Sep 89 20:39:24 GMT
References: <473@shuldig.Huji.Ac.IL> <1989Sep5.121104.10155@gpu.utcs.utoronto.ca>
Reply-To: budd@bu-it.bu.edu (Phil Budne)
Followup-To: comp.protocols.appletalk
Organization: Boston University
Lines: 15

In article <1989Sep5.121104.10155@gpu.utcs.utoronto.ca>
	nishri@gpu.utcs.UUCP (Alex Nishri) writes:

>The first problem is that the Mac II must be directly on an ethernet
>and not on a Localtalk behind a Gatorbox.  This is because the
>Gatorbox (and Fastpath, we understand) do not handle TCP/IP packet
>fragmentation; most Internet SMTP servers use large packet sizes and
>these end up on the floor.

I seem to remember NCSA Telnet over localtalk sends a TCP MSS option
requesting minimal (576) maximum segment size.  The one MacTCP
application I looked at sends an MSS request of 1024 when running over
localtalk.

	Phil Budne, Boston University