Redirect a broadcast

darrenriley5 · ‎05-01-2009

I have some software which broadcasts on port 36 to find a network device. The problem is the device it needs to find is on another vlan. Is it possible to redirect this broadcast as a unicast to the correct device and if so are there any issues with this i should be aware of.

Many Thanks

bretjaquish · ‎05-01-2009

I'm assuming the protocol is TCP/UDP based?

You might be able to use the ip directed-broadcast, but there are a lot of security related implications to this method.

Another option I have used in the past for non-routable protocols is to TUNNEL the traffic using GRE to the remote destination. This would be the preferred method of transport.

mikegrous · ‎05-01-2009

I think what you want is the intermediate helper. It will convert broadcast to multicast so it can transverse multiple subnets.

http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_inter_mc_helper_ps6350_TSD_Products_Configuration_Guide_Chapter.html