Enabling Directed Broadcast-to-Physical Broadcast Translation
By default, IP directed broadcasts are dropped; they are not forwarded. Dropping IP directed broadcasts makes routers less susceptible to denial-of-service attacks.
You can enable forwarding of IP directed broadcasts on an interface where the broadcast becomes a physical broadcast. If such forwarding is enabled, only those protocols configured using the ip forward-protocol global configuration command are forwarded.
You can specify an access list to control which broadcasts are forwarded. When an access list is specified, only those IP packets permitted by the access list are eligible to be translated from directed broadcasts to physical broadcasts.
To enable forwarding of IP directed broadcasts, use the following command in interface configuration mode:
ip directed-broadcast [access-list-number] (ACL is optional)
Hope this helps,
Don
