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Date:      Thu, 10 Feb 2000 16:57:26 +0000
From:      "M.J.Stachnicki" <M.J.Stachnicki@ukc.ac.uk>
To:        freebsd-bugs@FreeBSD.ORG
Subject:   mrouted under FreeBSD 3.?
Message-ID:  <E12IwuE-0002qs-00@apple.ukc.ac.uk>

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I thought I should let you know about this as it may affect other
applications although I have got around the problem by using a older
version of FreeBSD (2.2.8).

I was trying to use a couple of old 486 PCs to act as MBONE routers for
a couple of subnets here at the university. I installed the latest
version of FreeBSD (3.3) and rebuilt the kernel with multicast support.
When mrouted was started it established a tunnel to our main MBONE
router and all appeared to be working. However clients on the subnet
could still not see MBONE traffic. Some experments showed that starting
an MBONE application (SDR) on the FreeBSD system would then cause it
to start forwarding MBONE traffic, it would then continue to work until the
system was rebooted or mrouted was killed and restarted. Clearly some
part of the multicast interface was not getting setup correctly. At
that time FreeBSD 3.4 was released so I tried rebuilding one of the
routers with this but the same effects were observed.

I did some investigation and found out that the version of mrouted that
comes with FreeBSD dated back to version 2.? of FreeBSD. I decided to
rebuild one of the systems with FreeBSD 2.2.8, this cured the problem.

I can only assume that there are some subtle differences in the multicast
interface between release 2.? and release 3.? .

If you need any further information please let me know.


Mike Stachnicki
Network support
Computing service
University of Kent
Canterbury, UK



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