Time to add 2002::/16 to bogon filters?

Tue Jun 19 00:31:43 UTC 2018

If you are using 2002::/16 you know are relying on third parties.  Not that it is much
different to any other address where you are relying on third parties.

If one is going to filter 2002::/16 from BGP then install your own gateway to preserve
the functionality.

> On 19 Jun 2018, at 10:23 am, Ca By <cb.list6 at gmail.com> wrote:
> 
> 
> 
> On Mon, Jun 18, 2018 at 4:37 PM Mark Andrews <marka at isc.org> wrote:
> If a ASN is announcing 2002::/16 then they are are happy to get the traffic.  It
> they don’t want it all they have to do is withdraw the prefix.  It is not up to
> the rest of us to second guess their decision to keep providing support.
> 
> That sounds like an interesting attack scenario where a malicious actor can insert themselves in a path, via bgp, announcing 6to4 space 
> 
> 
> If you filter 2002::/16 then you are performing a denial-of-service attack on
> the few sites that are still using it DELIBERATELY.
> 
> None of the problems required removing it from BGP.  There were end sites that
> had firewalls that blocked 6to4 responses and the odd site that ran a gateway
> and failed to properly manage it.  The rest could have been dealt with by
> configuring more gateways.  If every dual stacked ASN had run their own gateways
> there wouldn’t have been a scaling issue.  i.e. take the 2002::/16 traffic and
> dump it onto IPv4 as soon as possible and take the encapsulated traffic for the
> rest of IPv6 and de-encapsulate it as soon as possible.
> 
> Mark
> > On 19 Jun 2018, at 8:56 am, McBride, Mack <C-Mack.McBride at charter.com> wrote:
> > 
> > This should have been filtered before.
> > Lots of people improperly implemented this so it caused issues.
> > 
> > Mack
> > 
> > -----Original Message-----
> > From: NANOG [mailto:nanog-bounces at nanog.org] On Behalf Of John Kristoff
> > Sent: Monday, June 18, 2018 3:48 PM
> > To: Job Snijders <job at ntt.net>
> > Cc: NANOG [nanog at nanog.org] <nanog at nanog.org>
> > Subject: Re: Time to add 2002::/16 to bogon filters?
> > 
> > On Mon, 18 Jun 2018 21:08:05 +0000
> > Job Snijders <job at ntt.net> wrote:
> > 
> >> TL;DR: Perhaps it is time to add 2002::/16 to our EBGP bogon filters?
> > 
> > Hi Job,
> > 
> > I've been asking people about this recently.  I don't particularly like having misdirected traffic or badly configured hosts sending junk to those who happen to be announcing addresses from this prefix.  I'm planning on adding this to a bogon filter here.
> > 
> > John
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> 
> -- 
> Mark Andrews, ISC
> 1 Seymour St., Dundas Valley, NSW 2117, Australia
> PHONE: +61 2 9871 4742              INTERNET: marka at isc.org
> 

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org