Date: Fri, 15 Dec 1995 08:45:05 -0600 (CST) From: Mark Tinguely <tinguely@plains.nodak.edu> To: freebsd-hackers@freefall.freebsd.org, kuku@gilberto.physik.rwth-aachen.de Subject: Re: mrouting/multicast Message-ID: <199512151445.IAA01928@plains.nodak.edu>
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> Is there a simple way to test multicasting? I'm
> trying to get a vat connection going on my local
> ethernet but one machine (the one running mrouted)
> doesn't see the local machine's session.
if you are simply testing a multicast on a local segment (no routers between
hosts), you do not need the mrouted (the MBONE router).
the simplest test would be using sd to start a nv session and use the
X Grabber (the X Grabber requires that you are running 8 bit graphics
not 16 or 24). Start the sending on the one machine and you should see
it on the other machine. If you want you can display the multicast traffic
by using tcpdump:
tcpdump net 224
There are some ethernet cards (the 3Com 309 --ep driver-- comes to mind
as one such card) that does not support multicast in 2.1.0R and there
is a patch in 2.0.5 for the ep.c that works but is a use at your own risk.
This 2.0.5 patch does not work with the 2.1.0R ep.c driver, as a temporary
solution for another local school I had to use the 2.0.5 patched driver in
2.1.0R kernel. To see if you card is multicast capiable, type :
ifconfig -a
and you should see something like:
|||||||||
vvvvvvvvv
ed0: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 134.129.125.6 netmask 0xffffc000 broadcast 134.129.127.255
if you are testing your MBONE router tunnels, then use the application
mrinfo. it gives excellent information on the status of the connection.
I would like to say that drop on replacements for mrouted 3.8 (needed to
fix prunning errors in earlier releases is available at:
ftp://parcftp.xerox.com/pub/net-research/ipmulti/mrouted3.8-i386-bsd.tar.gz
I highly recommend everyone running mrouted under FreeBSD to go out and replace
their old 3.{5 6} binaries.
--mark.
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