[unisog] Port 0

John Kristoff jtk at northwestern.edu
Tue Nov 1 00:37:06 GMT 2005

On Mon, 31 Oct 2005 18:20:50 -0600
Alan Amesbury <amesbury at oitsec.umn.edu> wrote:

> to what I think was mentioned for ICMP.  Near as I can tell, IGMP
> isn't supposed to span administrative boundaries, i.e., it's something
> that should probably be blocked at borders.  However, I've no direct
> experience with IGMP, so my IGMP kung fu is, in a word, weak.

IGMP shouldn't even be forwarded past a multicast-enabled router
interface.  For all practical purposes it only has link local


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