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From: mouse@mcgill-vision.UUCP
Newsgroups: comp.unix.questions
Subject: Re: 4.3 <-> 4.2 udp
Message-ID: <595@mcgill-vision.UUCP>
Date: Sun, 11-Jan-87 06:53:07 EST
Article-I.D.: mcgill-v.595
Posted: Sun Jan 11 06:53:07 1987
Date-Received: Sat, 17-Jan-87 16:39:03 EST
References: <896@ulowell.UUCP>
Organization: McGill University, Montreal
Lines: 27

In article <896@ulowell.UUCP>, page@ulowell.UUCP (Bob Page) writes:
> After I brought up 4.3bsd and Ultrix 1.2, rwho/ruptime to our 4.2bsd
> based machines broke.  From 4.2 to 4.3 works ok, however, and the 4.2
> machines can see each other.

> What changes are needed to have 4.3 based machines seen by the 4.2
> ones?

In the ifconfig commands to start the 4.3 network interfaces what
broadcast value are you giving?  4.3, by default, uses the right thing:
a host number of all ones (but you can change it).  4.2 uses a host
number of all zeros (wrong, and you can't change it).  So for 4.2 and
4.3 to exchange broadcast packets you have to give a zero broadcast
address on the 4.3's ifconfig.  For example, our LAN uses 200.0.0.x
addresses, and the 4.3 ifconfig reads

ifconfig de0 inet `hostname` up -trailers broadcast 200.0

If this isn't it I dunno.  Our 4.3 VAXen seem to speak rwho to our Suns
and Ultrix machines just fine, so it's nothing fundamental.

					der Mouse

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