[ipv6hackers] Fwd: Some stats on IPv6 fragments and EH filtering on the Internet

Fernando Gont fgont at si6networks.com
Thu Nov 7 12:18:43 CET 2013

On 11/07/2013 02:57 AM, Enno Rey wrote:
> Hi,
>>> As of late 2013 I personally can't really see much use/need for
>>> fragmented IPv6 traffic at all.
>> DNS?
> heard that many times ;-)
> may I ask (the list) two questions:
> a) need for fragmented DNS_over_IPv6 inbound into an enterprise network (as opposed to a SP environment)?

If you're sending queries, you can expect fragmentation. -- not to
arbitrary nodes if you're using a caching DNS server, though.

Tunnels, as noted, are another eample.

> b) as you, Fernando, like to ask: any real-world numbers here anybody? [amount/numbers/percentage of fragmented DNS_over_IPv6 traffic]

You won't find much: many v6-enabled systems use v4 transport for dns.
-- and this one is not that easy to measure as the support for fh and
ext headers (you need to have access to interesting points in the network).

Fernando Gont
SI6 Networks
e-mail: fgont at si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492

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