All things related to multicast

[Simon Leinen <>]

Amel Caldwell writes:
> I modified our inbound spoofing filters to deny ip any 239.255.0.0
> 0.0.255.255 before permitting the local subnet traffic out.  I don't
> know the ramifications on CGMP on this approach though.

Attention... 239.255.0.0/16 is supposed to be "site" scope, not "subnet".

In our network, we have the problems that some sites (Universities)
don't run their own RPs and are thus part of our (national research
backbone) PIM-SM domain.  It's not quite clear to me how we can filter
e.g. 239.255.0.0 traffic without breaking internal 239.255 multicast
for those sites.
-- 
Simon.