[dns-operations] High IPv6 latency between a.root-servers.net and AS3320

[Robert Kisteleki]

We have lots and lots of measurements in RIPE Atlas to help here, and also
some visualisations like
https://atlas.ripe.net/results/maps/root-instances/?server=9&question=10300&af=6&filter=&show_only=
which illustrates the issue quite clearly.

Cheers,
Robert


On 2016-10-10 16:26, Weinberg, Matt wrote:
> Sebastian,
> 
> We’re happy to look at this further with you.  Could you please contact me directly to troubleshoot further?  
> 
> Thanks,
> Matt
> 
> 
> Matt Weinberg
> Director, Resolution Operations
> mweinberg at verisign.com
>  
> m: 703-999-5670  t: 703-948-4678
> 12061 Bluemont Way, Reston, VA, 20190
> Verisign.com <http://www.verisigninc.com/>
>  
> 
> On 10/10/16, 9:59 AM, "dns-operations on behalf of Sebastian Wiesinger" <dns-operations-bounces at dns-oarc.net on behalf of sebastian at karotte.org> wrote:
> 
>     Hello,
>     
>     we noticed a high latency when querying a.root-servers.net from
>     AS3320 over IPv6.
>     
>     These are the graphs we get for IPv4 and IPv6:
>     
>     https://www.karotte.org/pics/a-root-AS3320-v4.png
>     https://www.karotte.org/pics/a-root-AS3320-v6.png
>     
>     As you can see IPv4 latency is around ~12ms and IPv6 latency is around
>     200ms with up to 600ms and packetloss at (I assume) peak times.
>     
>     Querying the hostname via IP6 gives me "rootns26-fra1" or
>     "rootns23-fra1" while querying via IPv4 gives "rootns20-fra1" or
>     "nnn1-fra1" which suggests IPv6 should still be Frankfurt.
>     
>     A traceroute doesn't help much:
>     
>     traceroute to 2001:503:ba3e::2:30 (2001:503:ba3e::2:30) from 2003:61:4002::2, 15 hops max, 24 byte packets
>      1  2003:61:4002::1 (2003:61:4002::1)  3.592 ms  4.16 ms  1.477 ms
>      2  * * *
>      3  xe-1-1-0.r1.bb-fo.sfo1.vrsn.net (2001:504:d::c1)  169.598 ms  165.617 ms  167.042 ms
>      4  xe-0-2-0.r2.bb-fo.sfo1.vrsn.net (2620:0:5050:fa01::96)  164.333 ms  185.201 ms  160.947 ms
>      5  xe-1-2-0.r2.bb-fo.lax2.vrsn.net (2620:0:5050:fa01::7d)  176.661 ms  174.751 ms  175.169 ms
>      6  xe-1-1-0.r2.edge-fo.lax2.vrsn.net (2620:0:5050:fa02::56)  180.437 ms  174.502 ms  174.655 ms
>      7  * * *
>      8  * * *
>     
>     I assume some sort of routing weirdness but can't find out more... I
>     hope someone here can help in sorting this out.
>     
>     Best Regards
>     
>     Sebastian
>     
>     -- 
>     GPG Key: 0x93A0B9CE (F4F6 B1A3 866B 26E9 450A  9D82 58A2 D94A 93A0 B9CE)
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>                 -- Terry Pratchett, The Fifth Elephant
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