UDP on Sun and VAXen - Thanks for replies - Thread - go-pugleaf

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2 total messages Started by Special Projects Group Thu, 31 Oct 1985 20:23

UDP on Sun and VAXen - Thanks for replies

#24

Author: Special Projects Group
Date: Thu, 31 Oct 1985 20:23

33 lines
1848 bytes

Many thanks to all those that replied to my problems with UDP and
with talk (which uses UDP.) I started to reply in person to everyone
but was being flooded, so ...

For anyone else interested, there were two problems. The first is
that I trusted 'talk' to be correct and it's not. It does not
take into account the machine dependencies. The VAXen stores
bytes in one order and the SUN in the other so while it is a valid
address on one end, it's reversed on the other. A htons(port)
fixes that nicely. (The politest comment I heard about talk was
that it was brain-dead. The comments got a lot worse...)

The second problem is that the UDP that came with earlier releases
of 4.2BSD aparently did not checksum UDP correctly while it seems
that SUN fixed this. The later releases of 4.2 are rumored to have
this fixed and fixes were posted to net.unix-wizards sometime last
year, I believe.

So, again, thanks for all the help.

-- 
David C. Kovar  -- Special Projects Group
  
	    USNET:      {linus|decvax|cornell|astrovax}!dartvax!networks
	    ARPA:	networks%dartmouth@csnet-relay
	    CSNET:	networks@dartmouth

	    US Mail:    Kiewit Computation Center
			Dartmouth College
			Hanover NH
			03755

	    Phone:	(603) 646-3144

Re: UDP on Sun and VAXen, HELP#3

#30

Author: Roger M. Fujii
Date: Tue, 05 Nov 1985 04:19

26 lines
1836 bytes

> For anyone else interested, there were two problems. The first is
> that I trusted 'talk' to be correct and it's not. It does not
> take into account the machine dependencies. The VAXen stores
> bytes in one order and the SUN in the other so while it is a valid
> address on one end, it's reversed on the other. A htons(port)
> fixes that nicely. (The politest comment I heard about talk was
> that it was brain-dead. The comments got a lot worse...)
> 
> The second problem is that the UDP that came with earlier releases
> of 4.2BSD aparently did not checksum UDP correctly while it seems
> that SUN fixed this. The later releases of 4.2 are rumored to have
> this fixed and fixes were posted to net.unix-wizards sometime last
> year, I believe.
> 
>

Could someone repost the bug-fix for the checksum problem in 4.2?
I'm trying to get talk to work between a SUN and a VAX.  I have tried 
the hton....ntoh hacks, but the only thing that has accomplished
is putting hair on the floor.  My hair and I gives thanks in advance.

Roger Fujii
fujiirm%rpics.csnet@csnet-relay    ARPA
fujiirm@rpics                      CSNet
fujiirm@RPI-MTS                    Mailnet
seismo!rpics!fujiirm               UUCP

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