All things related to multicast

[Bill Nickless <>]

On Thu, 4 Sep 2003, David Farmer wrote:

> We still need to say you SHOULD filter them and we need it to 
> become BCP that networks actually filter them.  How you actually 
> filter them is really a local implementation issue.  Although making 
> it easy is a good thing.

How does the following sound?

1.  The mcast-unusable draft is intended (partially) to give IANA
    advice about what groups should be permanently reserved.

    So I don't think it makes sense to put the bogon list in the
    mcast-unusable draft, because the bogon list is controlled
    by IANA.  Something feels circular.  :-)

2.  The mcast-ipv4-bcp draft, on the other hand, could very well
    mention filtering bogons in the context of IANA reserved
    blocks, plus a (technically redundant?) link to the permanently
    unusable blocks in the mcast-unusable draft (and successors).

3.  David Farmer writes a draft for MBONED explaining how to
    automatically, safely, and securely update one's bogon/unusable
    filter list.  :-)  :-)

(Seriously, David, I'll be glad to work with you on #3 if you like.)
 
> On 4 Sep 2003 Bill Nickless wrote:
> 
> > 
> > How about doing something like this for the multicast groups that IANA 
> > hasn't yet allocated, or are otherwise unusable for various reasons?
> > 
> > What I like about it is that it's automated, rather than depending on a 
> > human in the loop everywhere to watch for IANA announcements.
> > 
> > Having only spent about 20-30 seconds thinking about it, I'm not sure 
> > whether it's possible to configure popular routers to black-hole traffic 
> > destined for groups that are in a table populated by BGP.  Maybe an 
> > inspiration will strike later?
> > 
> > ---------- Forwarded message ----------
> > Date: Thu, 4 Sep 2003 11:56:36 -0500 (CDT)
> > From: Rob Thomas 
> > <>
> > To: Christopher L. Morrow 
> > <>
> > Cc: NANOG 
> > <>
> > Subject: Re: What were we saying about edge filtering?
> > 
> > 
> > ] I'm going to take a stab at: The next 69.0.0.0/8 release? Certainly 
> > there
> > ] was some lesson learned from this, no?
> > 
> > Yep, and the lesson is:  Lots of folks do a poor job of network
> > management.  :(
> > 
> > Keeping up with the bogons can be automated, see:
> > 
> >    <http://www.cymru.com/BGP/bogon-rs.html>
> > 
> > -- 
> > Rob Thomas
> > http://www.cymru.com
> > ASSERT(coffee != empty);
> > 
> > 
> > 
> 
> 
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