Re: IPv6 ingress filter

[JORDI PALET MARTINEZ via NANOG <nanog () nanog org>]

Hi Amos,

 

Just responded in another mailing list on this:

 

6to4 is still a valid protocol. IT SHOULD NOT be filtered. 6to4 uses the same protocol as other tunnels such as 6in4 
(protocol 41).

 

https://www.ietf.org/rfc/rfc3056.txt

 

It works fine for peer to peer applications.

 

What the IETF deprecated is anycast for 6to4 relays:

 

https://tools.ietf.org/html/rfc7526

 

I believe Hurricane Electric still hosts 6to4 relays.


Regards,

Jordi

 

 

 

El 14/5/19 17:32, "NANOG en nombre de Amos Rosenboim" <nanog-bounces () nanog org en nombre de amos () oasis-tech net> 
escribió:

 

Hello,

 

As we are trying to tighten the security for IPv6 traffic in our network, I was looking for a reference IPv6 ingress 
filter.

I came up with Job Snijders suggestion (thank you Job) that can be conveniently found at whois -h whois.ripe.net 
fltr-martian-v6

 

After applying the filter I noticed some traffic from 6to4 addresses (2002::/16) to our native IPv6 prefixes 
(residential users in this case).

The traffic is a mix of both UDP and TCP but all on high port numbers on both destination and source.

It seems to me like some P2P traffic, but I really can’t tell.

 

This got me thinking, why should we filter these addresses at all ?

I know 6to4 is mostly dead, but is it inherently bad ?

 

And if so, why is the prefix (2002::/16) still being routed ?

 

I would love to hear some thoughts on this, and understand if others are actually filtering this at both data plane and 
control plane.

 

Thanks,

 

Amos Rosenboim

-- 

 



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