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

["Fabien VINCENT (NaNOG)" <list-nanog () beufa net>]

Le 2018-07-09 18:10, valdis.kletnieks () vt edu a écrit :

> On Mon, 09 Jul 2018 15:21:31 +0200, "Fabien VINCENT (NaNOG)" said:
>
> > I think it's still used a bit ? I see today announcements over the
> > following OriginAS over more than 2000 peers.
> >
> > as1103    SURFnet bv
> > as1835    Forskningsnettet - Danish network for Research and Education
> > as2847    Kauno technologijos universitetas
> > as6939    HURRICANE
> > as16150   Availo Networks AB
> > as25192   CZ.NIC, z.s.p.o.
> > as28908   A3 Sverige AB
>
> Announced and used are two different things.. :)
>
> sudo tcpdump -ni any 'net 2002::/16' tcpdump: verbose output 
> suppressed, use -v or -vv for full protocol  decode
> listening on any, link-type LINUX_SLL (Linux cooked), capture size 
> 262144 bytes
> 15:10:59.588097 IP6 2002:6bab:c6c6:0:e561:b9f7:b221:a73.51413 >  
> 2001:470:1f12:dead::beef.51413: UDP, length 94
> 15:10:59.588233 IP6 2001:470:1f12:dead::beef.51413 >  
> 2002:6bab:c6c6:0:e561:b9f7:b221:a73.51413: UDP, length 365

I'm pretty sure that 2002: address is (a) *your* end of the tunnel  and 
(b)
only visible inside your network and *inside* the HE tunnel to the other 
end.
In other words, it shouldn't be seen out on the public net if it's 
transiting
an HE tunnel. I bet if you changed that '-i any' to '-i wlan' (for 
whatever
your router calls the outbound-facing interface) you won't see traffic 
on 2002:


You're right, it does need to be public to work ;) So my question is why 
it is still and it was announced on DFZ ?

Regards,

--
FABIEN VINCENT
_@beufanet_