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

Jared Mauch jared at puck.nether.net
Mon Jun 18 23:00:13 UTC 2018


> On Jun 18, 2018, at 5:08 PM, Job Snijders <job at ntt.net> wrote:
> 
> Dear all,
> 
> TL;DR: Perhaps it is time to add 2002::/16 to our EBGP bogon filters?
> 
> It is kind of strange that in the default-free zone (where we don’t
> announce defaults to each other) - we will propagate what is effectively an
> IPv4 default-route, in the IPv6 DFZ.
> 
> IETF has politely abandoned the prefix:
> https://tools.ietf.org/html/rfc7526


I don’t believe there is a reason that folks should accept this prefix from a transit/peer.  If they have need for 6to4 within their network, they should operate their own local 6to4 relays.

It seems native IPv6 is fairly widely available:

https://www.google.com/intl/en/ipv6/statistics.html

And there is almost zero 6to4 activity in those stats as well.  Since it’s a known path for abuse as well, I would expect networks to not carry these IPv6 routes and filter them.

- Jared


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