Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/17/84 chuqui version 1.7 9/23/84; site daisy.UUCP
Path: utzoo!linus!decvax!decwrl!pyramid!nsc!daisy!wje
From: wje@daisy.UUCP (William J. Earl)
Newsgroups: net.dcom
Subject: Re: Ethernet problem
Message-ID: <142@daisy.UUCP>
Date: Tue, 11-Feb-86 13:54:22 EST
Article-I.D.: daisy.142
Posted: Tue Feb 11 13:54:22 1986
Date-Received: Thu, 13-Feb-86 20:17:13 EST
References: <113@otto.UUCP>
Reply-To: wje@daisy.UUCP (William J. Earl)
Organization: Daisy Systems Corp., Mountain View, Ca
Lines: 21

In article <113@otto.UUCP> carl@otto.UUCP (Carl Shapiro) writes:
>I'm having difficulty getting a VAX 750 to communicate with a pair
>of SUN-3's over Ethernet.  All are running 4.2bsd.  ...
>The problem comes when using rcp to send files from the VAX to either
>SUN - the copy fails (after a long wait) if the size of the file
>being copied exceeds 1023 bytes.  The other 4 paths (either SUN to the
>VAX, either SUN to either SUN) between the systems work fine.  Rlogin
>works fine in all directions.

     I have heard of a similar problem with respect to rcp
from a Daisy Concurrent Chipmaster (which runs 4.2bsd tcp/ip) 
to a SUN-3.  The problem is probably that the SUNs do not accept
the use of a trailer protocol by the VAX or the Daisy.  Both
the VAX and the Daisy use a trailer protocol for large transfers
(1024 bytes or more) by default.  To disable this feature, 
add the "-trailer" switch to the ifconfig command line in /etc/rc.
The effect of the SUNs not accepting the protocol is that the
large packets are discarded and the transfer eventually times out.
-- 
	William J. Earl
	Daisy Systems Corporation, Mountain View, CA