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IP directed broadcast

why do we use ip directed broadcast on serial interface.

In our case our UDP packet are not broadcast ?

can we use this command on serial interface

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Re: IP directed broadcast

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Re: IP directed broadcast

The original question was CAN you configure ip directed-broadcast on serial interfaces. The technically correct answer is YES you CAN configure this. But I see very little reason to do so. The directed-broadcast command controls whether the router will take an incoming directed broadcast (packet with destination address of the broadcast address of the local segment) and forward it with a layer 2 broadcast address. On serial interfaces there is not much point in configuring this where there is only one neighbor. (Perhaps a Frame Relay multipoint interface might be an exception)

When I was first learning about Cisco I thought that the directed-broadcast command would enable forwarding a directed broadcast toward some remote destination (and in that context configuring it on serial interfaces makes sense). But I soon learned that this was a mistaken understanding. A directed broadcast toward a remote destination will always be forwarded. The directed-broadcast command only affects broadcasts on the local subnet.

HTH

Rick

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