Date: Mon, 21 Aug 1995 13:26:29 -0400 (EDT) From: "Michael C. Newell" <mnewell@lupine.nsi.nasa.gov> To: hackers@freebsd.org Subject: Multicast on PPP devices Message-ID: <Pine.SUN.3.91.950821131558.10013K-100000@lupine.nsi.nasa.gov>
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The ppp devices on 2.0.5 have the multicast bit set. When I run mrouted
it dies with the errors:
Aug 21 13:14:40 sisyphus mrouted[8195]: warning - can't join group
224.0.0.4 on interface 198.116.75.49: Can't assign requested address
Aug 21 13:14:40 sisyphus mrouted[8195]: warning - can't join group
224.0.0.4 on interface 198.116.75.49: Can't assign requested address
Aug 21 13:14:40 sisyphus mrouted[8195]: setsockopt IP_MULTICAST_IF
198.116.75.49: Can't assign requested address
Aug 21 13:14:40 sisyphus mrouted[8195]: setsockopt IP_MULTICAST_IF
198.116.75.49: Can't assign requested address
In this case Sisyphus is our mbone router/ppp server (it's a FreeBSD
2.0.5-Stable system) and 198.116.75.49 is the address of the ppp0 link
(see "http://www.eco.nsi.nasa.gov/~mnewell/mc_net.gif" for a diagram of our
network.)
This is a tad bit of a problem. Of course it would be nice to be able
to run the ppp interfaces in native multicast mode to avoid tunnelling
overhead. However the situation is worse, since in order to bring up
mrouted I have to disable the ppp device via
phyint 198.116.75.49 disable
in the mrouted.conf file (otherwise I get the above errors.) This is a
problem because if you try to start mrouted when ppp0 is down (like when
Sisyphus is being rebooted) it gives an error on the phyint statement.
Of course, what you'd LIKE to have happen [well, at least what I'D like
to have happen] is for mrouted to simply ignore the interface if it can't
use it.
I guess the real question is: Has anyone successfully got native
multicast routing via mrouted running over the ppp link? If so, how did
you do it?
Thanks,
Mike
+--------------------------------------+------------------------------------+
|Mike Newell | The opinions expressed herein are |
|NASA Science Internet Network Systems | my own, and do not necessarily |
|Sterling Software, Inc. | reflect those of the NSI program, |
|MNewell@nsipo.nasa.gov | Sterling Software, NASA, or anyone |
|+1-202-434-8954 | else. |
+--------------------------------------+------------------------------------+
| work: http://www.eco.nsi.nasa.gov/~mnewell |
| home: http://www.newell.arlington.va.us |
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