bridging two subnets into one subnet

[bigeric]

Dear Sir

I have a multicast application which must be run under the same subnet for hosts to communicate.. How can I do that under the following topology (bridging ??). Host A and Host B run the multicast application (but won't work if in different subnets)

Host A ---- Cisco 1841 ---firewall(pppoe)-- adsl circuit ---- Internet ---- adsl circuit --- firewall(pppoe) --- Cisco 1841 -- Host B

is there any way to bridge the network of Host A and Host B so that both hosts are working in the same subnet ??

I can change the setup to below and use bridging (but no preferable)

Host A -- cisco 1841 -- Metro E -- Cisco 1841 -- Host B

thx

Eric

[Georg Pauwen]

Hello Eric,

you could build a tunnel between the two Cisco 1841 routers and send all multicast traffic through that tunnel. The tunnel would be a simple GRE tunnel, but it has to be configured for whatever mode (sparse, sparse-dense, dense) you are deciding to use.

Just make sure that all your multicast traffic is going through the tunnel, by configuring a static mroute on both routers:

ip mroute 0.0.0.0 0.0.0.0 tunnel 0

Let me know if you need help with the configuration.

Regards,

GP