Path: utzoo!attcan!uunet!seismo!sundc!pitstop!sun!decwrl!labrea!rutgers!tut.cis.ohio-state.edu!bloom-beacon!bu-cs!mirror!ima!think!ephraim
From: ephraim@think.COM (Ephraim Vishniac)
Newsgroups: comp.protocols.appletalk
Subject: Re: tweaking NCSA Telnet's ftp performance?
Message-ID: <30762@think.UUCP>
Date: 9 Nov 88 16:45:47 GMT
References: <30734@think.UUCP>
Sender: news@think.UUCP
Reply-To: ephraim@vidar.think.com.UUCP (Ephraim Vishniac)
Organization: Thinking Machines Corporation, Cambridge MA, USA
Lines: 29

In article <30734@think.UUCP> ephraim@think.COM (that's me) writes:
>Questions:

>1. Is there an NCSA Telnet 2.2e?  I looked around briefly at
>   zaphod.ncsa.uiuc.edu, but I only saw 2.2, not 2.2e.

OK, OK, RTFM.  2.2 combines the AppleTalk and Ethernet versions, as it
says in the changes list.  Now I know.

>2. What are the actual limits on mtu and maxseg?  Can I expect
>   noticably improved performance if I increase them?  What are
>   the hazards or drawbacks of larger values?

>I'm also interested in any general folk wisdom about tuning ftp, since
>I'm new to this.

I'm getting very confused about this.  I'm retrieving files from a VAX
8800 on TMC's "main net."  Running ftp directly to VAX gets me
5.3KB/S.  Running ftp to the gateway machine (a Sun 3/280) or to a
diskless Sun 3/50 on the same subnet as the Mac gets me 13 or 14KB/S.

Can anyone explain why going straight to the VAX is a disadvantage?


Ephraim Vishniac					  ephraim@think.com
Thinking Machines Corporation / 245 First Street / Cambridge, MA 02142-1214

     On two occasions I have been asked, "Pray, Mr. Babbage, if you put
     into the machine wrong figures, will the right answers come out?"