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Broadcasts across Subnets

Unanswered Question
Oct 26th, 2006
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I have a server that sits on one side of a router and a number of clients that sit on the opposite of the router (different Subnet). The Server needs to send a broadcast out across the router to the clients. Has anyone any ideas how to do this ?


IP helper does not help as in this case I have one device talking to many and not many devices talking to one


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hi, can you not use a helper address but send traffic to the broadcast address of the destination network? You'll need "ip directed-broadcast" on the inbound interface of the destination router. Failing that a "multicast helper-map" is designed to translate broadcast to multicast the broadcast again. This could also be configured to get your required solution but would require multicast enabled (so may be overly complex).



source of broadcast

int fas0/0

ip helper-address 2.2.2.255

exit

ip forward-protocol udp

ip directed-broadcast





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