[Xorp-hackers] Multicast routing

Suresh kannan sureshkannan at gmail.com
Thu Feb 15 00:12:18 PST 2007

Hi Sachin,

Opening RAW socket for IPPROTO_IGMP, will get all IGMP packets regardless of
its destination address from kernel to XORP.

Can i know, where it says it will only get packets. I'm not aware
such a filtering in RAW socket.

Suresh kannan.

On 2/15/07, Sachin K <sachinutd at gmail.com> wrote:
> How does the XORP multicast router sniff IGMP/MLD messages from the
> network?
> I checked the some routers' code. Most of them just open a RAW socket with
> protocol set to IPPROTO_IGMP. But using this the router gets the
> packets addressed to only.
> How does it receive IGMPv2 and IGMPv3 membership reports sent by other
> hosts?
> Thanks,
> Sachin
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