[dns-operations] CloudFlare public DNS IPv6 anycast high latency from HE in USA?

[Teun Vink]

Hi,

We observed similar issues here (AS12859, NL). As far as I can tell, HE 
started advertising the prefixes containing Cloudflare’s DNS servers 
this weekend via public IXPs (AMS-IX, NL-ix, DE-CIX), causing traffic 
towards those destinations to take a nice detour across the Atlantic. We 
have changed some routing policies to lower preference on routes offered 
by HE and contacted CloudFlare to setup more direct peering sessions.

Regards,
Teun


On 22 Feb 2021, at 23:33, Viktor Dukhovni wrote:

> For CloudFlare public DNS IPv6 addresses:
>
> 	2606:4700:4700::1111
> 	2606:4700:4700::1001
>
> I see unexpectedly high latency from two distinct networks in the USA,
> where the common factor is plausibly an early transit via Hurricane
> Electric.  From both networks (isi.edu in LA, and my home network in
> NYC) these addresses appear to be routed to the Far East at 200+ms
> latency (aparently to Thailand!).  Anyone else seeing similar results?
> I think this is a recent change (perhaps a few days now)...  Not sure
> whom to nag (I did ping Olafur et. al.), but perhaps the problem is
> at HE or elsewhere?
>
> LA (isi.edu):
> -------------
> $ traceroute6 -f4 -n 2606:4700:4700::1111
>  4  2001:468:e00:801::2  0.999 ms  0.928 ms  0.851 ms
>  5  2001:470:0:72::2  0.770 ms *  0.734 ms
>  6  2001:470:0:523::2  107.197 ms  107.604 ms  107.601 ms
>  7  2001:470:0:3f0::1  175.046 ms  174.557 ms  175.149 ms
>  8  2001:470:1:be2::2  205.189 ms  205.306 ms  205.217 ms
>  9  2403:d300:400:4000::1  204.082 ms  204.022 ms  204.017 ms
> 10  2404:8d04:4840:4001::3  204.962 ms  204.769 ms  204.907 ms
> 11  2400:cb00:175:1024::a29e:cd15  202.823 ms 
> 2400:cb00:175:1024::a29e:cd1d  202.870 ms 
> 2400:cb00:175:1024::a29e:cd21  202.608 ms
>
> PTR records:
> 2001:468:e00:801::2 hurricane--lax-hpr-peer.cenic.net
> 2001:470:0:72::2 100ge14-1.core1.lax2.he.net
> 2001:470:0:523::2 100ge5-2.core1.tyo1.he.net
> 2001:470:0:3f0::1 100ge11-1.core1.sin1.he.net
> 2001:de8:4::1:89:3 10089.sgw.equinix.com
>
> MaxMinds country GeoIP:
> 2001:468:e00:801::2: US, United States
> 2001:470:0:72::2: US, United States
> 2001:470:0:523::2: US, United States
> 2001:470:0:3f0::1: US, United States
> 2001:de8:4::1:89:3: JP, Japan
> 2403:d300:400:4000::1: HK, Hong Kong
> 2404:8d04:4840:4001::3: TH, Thailand
> 2400:cb00:175:1024::a29e:cd1d: TH, Thailand
>
> NYC (Verizon Fios -> HE tunnel):
> --------------------------------
> $ traceroute6 -f4 -n 2606:4700:4700::1111
>  4  2001:470:0:18e::2  30.834 ms  30.221 ms  31.226 ms
>  5  2001:470:0:22a::1  92.222 ms  95.435 ms  77.114 ms
>  6  2001:470:0:268::2  140.216 ms  143.346 ms  143.987 ms
>  7  2001:470:0:3f0::1  283.903 ms  208.104 ms  210.580 ms
>  8  2001:de8:4::1:89:3  209.758 ms  209.723 ms  210.285 ms
>  9  2403:d300:400:4000::1  237.480 ms  251.551 ms  244.256 ms
> 10  2404:8d04:4840:4001::3  236.858 ms  241.120 ms  240.160 ms
> 11  2400:cb00:175:1024::a29e:cd11  240.004 ms
>     2400:cb00:175:1024::a29e:cd15  240.900 ms
>     2400:cb00:175:1024::a29e:cd21  240.391 ms
>
> PTR records:
> 2001:470:0:18e::2  100ge14-2.core1.msp1.he.net
> 2001:470:0:22a::1  100ge11-2.core1.sea1.he.net
> 2001:470:0:268::2  100ge11-2.core1.tyo1.he.net
> 2001:470:0:3f0::1  100ge11-1.core1.sin1.he.net
> 2001:de8:4::1:89:3  10089.sgw.equinix.com
>
> GeoIP:
> 2001:470:0:18e::2: US, United States
> 2001:470:0:22a::1: US, United States
> 2001:470:0:268::2: US, United States
> 2001:470:0:3f0::1: US, United States
> 2001:de8:4::1:89:3: JP, Japan
> 2403:d300:400:4000::1: HK, Hong Kong
> 2404:8d04:4840:4001::3: TH, Thailand
> 2400:cb00:175:1024::a29e:cd1d: TH, Thailand
> 2400:cb00:175:1024::a29e:cd15: TH, Thailand
> 2400:cb00:175:1024::a29e:cd19: TH, Thailand
>
> -- 
> 	Viktor.
>
>
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