[buug] Need lil help in mrouted problem

Umesh Balani UmeshB at NIIT.com
Thu Jan 15 23:11:20 PST 2004


Hi Guys, 

Please help.

Here's what I am trying to do.

I have two Subnets on my lan, i.e. 172.17.24.0 (mask 255.255.255.0) and
172.17.26.0 (mask 255.255.254.0) 
My App is VIC (actually using something as CVW Server, with VIC as one of
its components)

Overview of my network.


			Hardware Layer 3 Switch with IP Forwarding enabled
(but no MCAST forwarding enabled)
			172.17.24.1	172.17.26.1

Windows Box 						Windows Box
172.17.24.96						172.17.26.97
Def Gateway 172.17.24.1				Def Gateway 172.17.26.1
VIC Broadcasts						VIC Should Be able
to subscribe.
VIC Should Be able to subscribe.			VIC Broadcasts



Since my switch does not enable Mcast forwarding I have setup a mrouted
tunnel on FreeBSD this way



			Hardware Layer 3 Switch with IP Forwarding enabled
(but no MCAST forwardign enabled)
			172.17.24.1	172.17.26.1


Freebsd 5.2 Box(with mrouted 1st end point)		Freebsd 5.2 Box(with
mrouted 2nd end point)
172.17.24.45			<------------------------>
172.17.26.201
Def Gateway 172.17.24.1				Def Gateway 172.17.26.1


Here is the mrinfo result on both the bsd boxes that tells me the tunnel is
up and running. mrinfo 172.17.26.201 172.17.26.201 (172.17.26.201) [version
3.255,prune,genid,mtrac
  172.17.26.201 --> 0.0.0.0 (local) [1/1/leaf]
  172.17.26.201 --> 172.17.24.45 (172.17.24.45) [1/1/tunnel]

mrinfo 172.17.24.45
172.17.24.45 (172.17.24.45) [version 3.255,prune,genid,mtrace]
  172.17.24.45 --> 0.0.0.0 (local) [1/1/leaf]
  172.17.24.45 --> 172.17.26.201 (172.17.26.201) [1/1/tunnel]

Yes.. I had compiled the kernel with the mrouting option.

Here are the mrouted.conf files for the both end points.

End Point 172.17.24.45
--------------------------------------
phyint ed0
tunnel 172.17.24.45 172.17.26.201


End Point 172.17.26.201
--------------------------------------
phyint rl0
tunnel 172.17.26.201 172.17.24.45

The Mcast range I am using is 239.10.x.x


Problems I am facing.
---------------------------------
1. Host in 24 subnet starts mcasting and the host in 26 sometimes
automatically gets the the mcast, sometimes doesn't get it and vice versa. 
Why is this happening. I have to restart one or both of the mrouted services
then the 
video appears on the other subnet box.

2. After a few minutes say 3 -5 mins the mcast transmission mysteriously
dies out. Cant understand why.

Please help...
__________________________
Regards
Umesh Balani

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