All things related to multicast

["David Farmer" <>]

What is your opinion of BOGON filters in general?  

In your opinion, is there anything particularly more problematic with 
a Multicast BOGON filter compared to a Unicast BOGON filter?

I'd suggest adding a section about Reserved Groups in your Draft 
on IPv4 Multicast Unusable Groups and Source Addresses.  Even 
if you come down against filtering them I think some discussion 
would be useful, espically since technically they shouldn't be used.

On 2 Sep 2003 Bill Nickless wrote:

> My $0.02;
> 
> Please don't block multicast group addresses, unless you have an automated 
> way to check the ARIN allocations and update your filters when ARIN 
> does allocate space for use.
> 
> (I dropped my laptop and have had no end of grief fixing it, which is my 
> poor excuse for not updating my two Internet Drafts before now.)
> 
> On Tue, 2 Sep 2003, David Farmer wrote:
> 
> > I had cause to take a look at RFC 3171 today.
> > 
> > So, I have a multicast best common practice (BCP) question.
> > 
> > Since 225.0.0.0 - 231.255.255.255 and 234.0.0.0 - 
> > 238.255.255.255 are reserved per section 2 and per section 11 
> > reserved space is not to be used by applications should any traffic 
> > destine to these locations be consider BOGON until assigned?
> > 
> > Would it be a bad idea to block it?  Particularly at an administrative 
> > boundary.
> > 
> > I don't see any discussion of reserved space in Bill Nickless' 
> > Internet Draft related to these issues.
> > 
> > http://www.ietf.org/internet-drafts/draft-nickless-ipv4-mcast-
> > unusable-02.txt
> > 
> > What do others think?  I what problems do you see in doing 
> > something like this?  
> > 
> > For sure you would have to monitor any new IANA assignments 
> > and update the filters to allow any new assignments.  But this 
> > shouldn't be anymore work that any other BOGON filters.
> > 
> > =================================================
> > David Farmer                                Email:  
> > 
> > Office of Information Technology
> > University of Minnesota                     Phone:  612-626-0815
> > 2218 University Ave SE                      Cell:   612-812-9952
> > Minneapolis, MN 55414-3029          FAX:    612-624-4035
> > =================================================
> > 
> > 
> 
> 


=================================================
David Farmer                            Email:  

Office of Information Technology
University of Minnesota                 Phone:  612-626-0815
2218 University Ave SE                  Cell:   612-812-9952
Minneapolis, MN 55414-3029              FAX:    612-624-4035
=================================================