[KLUG Members] Routing issue

[Adam Williams]

> I have a subnet 192.168.3.0/24 with a linux gateway 192.168.3.1.
> The gateway has a second NIC with IP 192.168.2.1 connected to the 
> 192.168.2.0/24 subnet in order to bridge the two subnets.

No, "route" not "bridge".  "Bridge" means something else entirely.

> I need to connect to a new dedicated T1 with a router/CSU/DSU with an IP 

What brand of router?

> of 10.7.35.1 in such a way that UDP multicast traffic on the 192.168.3.0 
> subnet also finds it way to the other end of the T1. Likewise, any 
> multicast traffic coming from the other side of the T1 needs to find its 
> way to the 192.168.3.0 subnet so multiple computers on the two LANs can 
> talk with a partyline app on the same multicast group.

The multicast part really depends upon the brand of router.

> My thought is to put a third NIC card in the 192.168.3.1 box and make that 
> interface 10.7.35.2. Then add some static routes to direct the flow.

Doesn't the router have an ethernet port?  That would reduce a hop.

> BUT, what else do I need to do to get the multicast flowing? There are 
> multiple subnets on the other side of the T1 particapating in the 
> multicast group.
> [10.7.34.0/24]
> [10.7.36.0/24]==T1==10.7.35.1[ ]192.168.3.1 =[sw]= 192.168.3.0/24 
>                            /=[ ]
>                            |192.168.2.1
>                            |
>                     192.168.2.0/24

What is on the far side of the T1?  (Assuming we are standing at
10.7.35.1).

I'd enable OSPF on the router and install a corresponding zebra config
on the Linux boxes.  Dynamic routing is much easier.