All things related to multicast

[Greg Shepherd <>]

Marshall,

Most of the SA entries I've seen in the reserved range are from
applications where the coder pulled a number out of their.. uh, rear
thought bucket - with only intradomain services intended. Add to this the
worm/DOS vulnerability of MSDP and blocking reserved groups wholesale
becomes appealing.

Greg

On Wed, 3 Sep 2003, Marshall Eubanks wrote:

> On Tue, 02 Sep 2003 22:25:12 -0500
>  "David Farmer" 
> <>
>  wrote:
> > On 2 Sep 2003 Matthew Davy wrote:
> >
> > > So what about applications that are hard-coded to use this address 
> > > space ?
> > > (*After* we flog the developers for doing something this bone-headed ;-)
> >
> > I'd suggest making them answer RIAA complaints for a couple months. ;-)
> >
> > > Should we block the addresses and then poke holes for the ones that 
> > > need it
> > ?
> >
> > Don't know, that would seem logical unless their is a big number of 
> > wholes.
> > That
> > would be the killer for this idea.
> >
> > It probably wouldn't be a good idea to do this on Abilene, any other
> > backbone, or
> > even at GigaPOPs, but at a campus border I think it might be very
> > appropriate.
> >
> > > Does anyone have a feel for how common this is ?
> >
> > I'll spin this back to to you MSDP mister, how much MSDP state do we see 
> > for
> > these blocks over the next few weeks.
>
> Here is the current status
>
> First Octet Histogram
>
>  Octet 224 had    529 entries or  39.21 %
>  Octet 225 had     24 entries or   1.78 %
>  Octet 226 had      7 entries or   0.52 %
>  Octet 227 had     19 entries or   1.41 %
>  Octet 228 had     72 entries or   5.34 %
>  Octet 229 had     30 entries or   2.22 %
>  Octet 230 had      9 entries or   0.67 %
>  Octet 231 had     11 entries or   0.82 %
>  Octet 233 had    499 entries or  36.99 %
>  Octet 234 had     23 entries or   1.70 %
>  Octet 235 had     14 entries or   1.04 %
>  Octet 236 had     81 entries or   6.00 %
>  Octet 237 had     16 entries or   1.19 %
>  Octet 238 had     15 entries or   1.11 %
>
> So the reserved space is being used, at the few % level.
>
> Marshall
>
>
> Marshall
>
>
>
> >
> > There shouldn't be anyone doing SSM on these blocks should their?
> >
> > Therefore, we should see MSDP state for any traffic, right?
> >
> > Another way would be to look at Netflow, I think.
> >
> > > - Matt
> >
> > =================================================
> > David Farmer                                Email:  
> > 
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> >
>
>