Subject: Re: Router Alert IPv4 Option
To: None <>
From: Darren Reed <>
List: tech-net
Date: 07/23/2001 22:17:20
In some email I received from Paul Goyette, sie wrote:
> Well, the packet should already be getting delivered to PIM, since pimd
> would be listening to the appropriate link-local multicast address
> anyway.
> The only real example I've seen where this is needed is for IGMP v1,
> where hosts send their membership reports to the group(s) of which they
> are a member.  Most hardware-based (ie, ASIC-based) routers these days
> won't see the report, since the router is not a member of the group (and
> having the router listen to every possible group is not feasible).
> One should note that almost all modern routing protocols (even IGMP v2)
> mandate that their packets be sent with the Router Alert option set.

If that's the case then we need to implement something, maybe even by 1.6.