[c-nsp] Multicast Issue

[Rodney Dunn]

Don't use that hack. The mcast should work.

On Thu, Apr 27, 2006 at 11:13:54AM -0600, John Neiberger wrote:
> >Vijay suggested that I might try using a multicast helper to convert
> >the multicast to a broadcast. I haven't tried this yet, but I wonder
> >what would happen if I converted the multicast address to the unicast
> >address of the server? I think I'll try it both ways just for grins.
> I
> >still don't understand why this isn't working as currently configured.
> I
> >just got out of a long meeting so now I've got some time to play with
> >it.
> 
> I just started playing around with multicast helpers. I think this
> might be an interesting way to solve this problem but I'm confused about
> how to use this feature in this scenario. I have a multicast entering on
> one interface that needs to be converted to a broadcast on another
> interface. Here's what I've got:
> 
> interface Vlan4    <---- this is where the multicast packet enters the
> 6513
>  ip address 10.a.b.c 255.255.255.0
>  ip directed-broadcast
>  no ip proxy-arp
>  ip pim dense-mode
>  ip route-cache policy
>  ip route-cache flow
>  ip cgmp
> end
> 
> 
> interface Vlan1             <----  This is where I want it to exit
> toward the server
>  ip address 10.d.e.f 255.255.255.0
>  ip directed-broadcast
>  no ip proxy-arp
>  ip pim dense-mode
>  ip multicast helper-map 224.0.1.55 10.1.100.35 AdvantageDB
>  ip route-cache flow
>  ip igmp static-group 224.0.1.55
>  ip cgmp
> end
> 
> I think I have the right command on Vlan1, but I think I still need
> something on Vlan4 that will forward the packet correctly. How about
> this:
> 
> ip multicast helper-map 224.0.1.55 224.0.1.55 AdvantageDB
> 
> That doesn't change the addressing but I have a suspicion that the
> command still needs to be there.
> 
> What do you think?
> 
> Thanks again!
> John
> --
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