Subject: Mrouted linux problem: Could anyone help us?

From: Antonia Maria Saez <[email-masked]>
Date: Fri, 31 Oct 1997 13:39:13 +0000

Hello

We are a spanish group from Alicante's University and we need help about
the following question:

We have a token ring network with several rings and we are trying to
establish a Mbone tunnel with other university. The machine which have
the tunnel is a linux. This Machine has two network cards: an ethernet
and a token ring and is connected outside through token-ring (this linux
driver doesn´t support multicast in token ring) and we try to establish
the tunnel with the ethernet card and transmit multicast in the ethernet
network.

To sum up, we try to use the linux as multicast and unicast router, but
we don´t receive any session in sdr. However if we have a second linux
machine connected only to the ethernet and we establish the mbone tunnel
with this second machine, it works well as multicast router and we
receive the sessions in sdr.

* This topology does not work

          Remote University
              #      .
              #      .
              #     _|_
              #    /   \
     (tunnel) #    \___/
              #      | Token Ring Card (does not support Multicast)
              #      |
              # +----+----+
              # |  Linux  |  Working as a unicast and multicast router
              # +----+----+
              #      | Ethernet Card (Its IP address is one of the
                     | sides of the tunnel)
                     |
       --------------+------------

* This one works fine

          Remote University
              #      .
              #      .
              #     _|_
              #    /   \
     (tunnel) #    \___/
              #      |
              # +----+----+
              # | Unicast |
              # |  router |
              # +----+----+
              #      |
       -------#------+--------+----
              #               |
              ################| Ethernet Card (Its IP address is one
                              |  of the sides of the tunnel)
                         +----+----+
                         |  Linux  |
                         +----+----+

Is necessary that the tunnel must be establish with the IP of the card
that receive physically the information?

Please can you help us!

Thanks in advance,
Antonia Maria.