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Broadcast through a router

I am working in a project where we wish to communicate on ethernet via a UDP protocol utilizing a broadcast. This works well in a stand-alone network, but when connecting networks via a router, this tecnique is not possible. Our approach is then to use a limited broadcast, for example address 192.168.0.255, to broadcast a known part of the net. As we tried this through a Cisco 4500, we had no success. Is it impossible to use this approach?

2 REPLIES
VIP Purple

Re: Broadcast through a router

Hello,

you have to use the ip-helper command (in interface configuration mode) in conjunction with the ip forward-protocol udp command (in global configuration mode), in your case it would look like this:

interface FastEternet0/0

ip helper-address 192.168.0.255

!

ip forward-protocol udp

HTH,

Georg

New Member

Re: Broadcast through a router

You can look into the ip multicast-helper approach.

Basically, the router will convert the broadcast into multicast and forward out into the last-hop router (receivers). Check out the Cisco Documentation CD for more detail on the implementation.

Rdgs

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