Directed broadcast not operational

[chieftan999]

I have the following networks set up:-

10.67.0.0 255.255.255.0
10.66.0.0 255.255.255.0

I am trying to send a broadcast message on UDP 5007 from the 10.67.0.0 network to the 10.66.0.0 network.

The router is named B4 at the 10.66.0.0 end.

I have configured the following on the router:-

ip forward-protocol spanning tree
ip forward-protocol UDP 5007

On the E1/0 Interface I have configured the following:-

ip broadcast-address 10.66.0.255

Have I missed something in the configuration as the broadcast will not go through.

 

[pmesjar]

You are not supposed to configure ip broadcast-address, but:

router(config-if)# ip helper-address 10.66.0.255

Since you are also using directed broadcast, don't forget to enbaled it on interfaced that will be target to directed broadcast using

router(config)# ip directed-broadcast

From security reasons enabling directed broadcast can help in some DoS attacks (eg. smurf), use it wisely.

Peter Mesjar
CCNA, A+ certified
pmesjar@centrum.sk