Re: multicast helper map and ip directed-broadcast

On R4's serial link

what does your helper-map look like?

On Tue, Oct 12, 2010 at 10:23 AM, Jack Router <pan.router_at_gmail.com> wrote:

> Hello Experts,
>
> I have a question regarding directed broadcast in multicast helper map: Why
> "ip directed-broadcast" is needed on R4 int F0/0? It does not work without
> it.
> For those who use Narbik workbooks it is about Vol2, Multicast, Lab 10.
>
> Topology:
>
> R1(F0/0)---(F0/0)R2--frame--R3--frame--R4(F0/0)---(F0/0)R5
>
> Multicast runs on R2, R3, R4
> R1 is configured to send broadcast updates.
>
> When I debug ip packets on R5 I see that R5 receives RIP updates from R1
> with destination address of 255.255.255.255. There is no 10.1.45.255 in the
> debug:
>
> *Mar 1 10:31:30.717: IP: s=10.1.12.1 (FastEthernet0/0), d=255.255.255.255,
> len 52, rcvd 2
>
> Why then ip directed-broadcast is needed in R4 F0/0 ? What it does ?
>
> Thanks,
>
>
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Received on Tue Oct 12 2010 - 10:38:02 ART