UUNet Offer New Protection Against DDoS

Wed Mar 3 23:00:22 UTC 2004

Oh, and I strip their communities, and apply no-export, on the first
term of my route map so the /32 does not get out. Of course my peer
facing policy requires specific communities to get out as well (belt and
suspenders).

This method works very well, and you do not have to give up length
restrictions or maintain two sets of customer prefix/access lists.

Jason

> -----Original Message-----
> From: Lumenello, Jason
> Sent: Wednesday, March 03, 2004 4:52 PM
> To: 'Stephen J. Wilcox'; james
> Cc: nanog at merit.edu
> Subject: RE: UUNet Offer New Protection Against DDoS
> 
> I struggled with this, and came up with the following.
> 
> We basically use a standard route-map for all customers where the
first
> term looks for the community. The customer also has a prefix-list on
their
> neighbor statement allowing their blocks le /32. The following terms
(term
> 2 and above) in the route-map which do NOT look for the customer
discard
> community, have a different standard/generic prefix-list evaluation
which
> blocks cruft and permits 0.0.0.0/0 ge 8 le 24.
> 
> By doing this, I only accept a customer /32 from his dedicated
prefix-list
> when it has the DOS discard community, otherwise I catch them with the
ge
> 8 le 24 in the following terms.
> 
> Jason Lumenello
> IP Engineering
> XO Communications
> 
> > -----Original Message-----
> > From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu] On Behalf
Of
> > Stephen J. Wilcox
> > Sent: Wednesday, March 03, 2004 3:48 PM
> > To: james
> > Cc: nanog at merit.edu
> > Subject: Re: UUNet Offer New Protection Against DDoS
> >
> >
> >
> > I'm puzzled by one aspect on the implementation.. how to build your
> > customer
> > prefix filters.. that is, we have prefix-lists for prefix and
length.
> > Therefore
> > at present we can only accept a tagged route for a whole block.. not
> good
> > if the
> > announcement is a /16 etc !
> >
> > Now, I could do as per the website at secsup.org which means we have
a
> > route-map
> > entry to match the community before the filtering .. but that would
> allow
> > the
> > customer to null route any ip.
> >
> > What we need is one to allow them to announce any route including
more
> > specifics of the prefix list - how are folks doing this?
> >
> > Steve
> >
> > On Wed, 3 Mar 2004, james wrote:
> >
> > >
> > > Global Crossing has this, already in production.
> > > I was on the phone with Qwest yesterday & this was one
> > > of this things I asked about. Qwest indicated they are
> > > going to deploy this shortly. (i.e., send routes tagged with
> > > a community which they will set to null)
> > >
> > >
> > > James Edwards
> > > Routing and Security
> > > jamesh at cybermesa.com
> > > At the Santa Fe Office: Internet at Cyber Mesa
> > > Store hours: 9-6 Monday through Friday
> > > 505-988-9200 SIP:1(747)669-1965
> > >
> > >