Re: Helper address usage

Hi Chris,

On Fri, Apr 3, 2009 at 12:40 PM, Christopher Copley
<copley.chris_at_gmail.com> wrote:
>
> So my thinking is put the helper address on F0/0 of R1 with address
> 100.1.3.99,

Correct. The "ip helper-address" command goes on the interface that
actually hears the broadcast. The router configured with the command
essentially turns the broadcast into a unicast towards the server IP
specified as a keyword.

> Do I also need to enable it on R4 and R3? and if so, on both
> interfaces?

Intermediate routers don't need to be configured in any special way --
they just need to be able to route the packet(s) towards the unicast
destination.

By default, a number of UDP broadcast protocols are forwarded by the
helper. I usually like to trim this list down. See the "ip
forward-protocol udp" command.

cheers,
Dale

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Received on Fri Apr 03 2009 - 12:48:47 ART