[Xorp-users] Problem setting up PIM-SM with Cisco on Amazon EC2

[Ben Greear]

On 02/09/2011 03:56 PM, Andriy Senkovych wrote:
> Hello, Ben!
>
>> I struggle every time I try to debug multicast, but you certainly
>> need at TTL large enough to cover all your router hops.
>
> Isn't TTL supposed to mean a lot for sender only? I thought IGMP join
> messages should just reach DR who is on the same net so TTL=1 for
> receiver should be sufficient.
>
> I played with TTL for receiver only, since i don't have an access to
> sender. However this is already on my troubleshooting list for the
> provider's tech support.

TTL on receiver should mean nothing at all, as far as I know.

It definitely matters on the sender.

You could sniff the pkts coming in from the sender to make
sure they have an appropriate TTL.

Thanks,
Ben

>
> Thanks.
>


-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com