#1 2015-11-01 22:27:02

mbence
Trusted Member
Registered: 2015-03-25
Posts: 12

AS20860 CloudFlare routing quirk?

I started monitoring my website from Nottingham, UK. I have found a strange routing issue as a byproduct. smile
It looks like web traffic for one of my domains gets routed over the Atlantic Ocean and hits CloudFlare at a Chicago datacentre. (Just to get back to the origin server in Europe.)

$ traceroute 104.28.23.1
traceroute to 104.28.23.1 (104.28.23.1), 30 hops max, 60 byte packets
 1  *.*.*.* (*.*.*.*)  0.173 ms  0.030 ms  0.034 ms
 2  *.as20860.net (*.*.*.*)  0.384 ms  0.456 ms  0.529 ms
 3  340.core2.dc4.as20860.net (62.233.127.245)  3.437 ms  3.494 ms  3.549 ms
 4  300.core1.dc4.as20860.net (62.233.118.229)  3.394 ms  3.453 ms  3.501 ms
 5  330.core1.thn.as20860.net (62.233.127.241)  7.297 ms  7.308 ms  7.305 ms
 6  be99.asr01.thn.as20860.net (84.22.164.90)  3.701 ms  3.732 ms  3.726 ms
 7  po99.core1.thn.as20860.net (84.22.164.89)  52.827 ms  52.831 ms  52.836 ms
 8  ae11.lon10.ip4.gtt.net (46.33.94.5)  13.405 ms  13.302 ms  13.269 ms
 9  xe-5-0-0.lon11.ip4.gtt.net (141.136.106.218)  3.264 ms xe-1-0-1.lon11.ip4.gtt.net (89.149.185.166)  3.270 ms xe-2-1-0.lon11.ip4.gtt.net (89.149.185.229)  3.557 ms
10  gtt-gw-cr1.lhr1.ip4.gtt.net (141.136.102.178)  3.307 ms  3.331 ms  3.337 ms
11  ae10-69.lon11.ip4.gtt.net (46.33.80.17)  3.689 ms  3.540 ms  3.649 ms
12  et-8-1-0.chi12.ip4.gtt.net (89.149.129.149)  93.110 ms  88.130 ms  93.115 ms
13  ae2-69.cr1.ord1.ip4.gtt.net (173.241.130.78)  88.425 ms  88.177 ms  88.070 ms
14  ip4.gtt.net (173.205.49.206)  95.947 ms  95.948 ms  92.244 ms
15  104.28.23.1 (104.28.23.1)  91.180 ms  91.198 ms  91.203 ms

The same domain has much lower latency over IPv6:

$ traceroute6 2400:cb00:2048:1::*:*
traceroute to 2400:cb00:2048:1::*:* (2400:cb00:2048:1::*:*), 30 hops max, 80 byte packets
 1  2*::2 (2*::2)  0.121 ms  0.055 ms  0.055 ms
 2  2001:1b40:f000:*::1 (2001:1b40:f000:*::1)  0.696 ms  0.601 ms  0.620 ms
 3  2001:1b40:f000:1d::2 (2001:1b40:f000:1d::2)  1.088 ms  1.137 ms  1.161 ms
 4  2001:1b40:f000:1a::1 (2001:1b40:f000:1a::1)  1.128 ms  1.159 ms  1.137 ms
 5  2001:1b40:f000:1c::1 (2001:1b40:f000:1c::1)  40.788 ms  40.799 ms  40.740 ms
 6  ldn-b5-link.telia.net (2001:2000:3080:53e::1)  3.223 ms  3.343 ms  3.249 ms
 7  cloudflare-ic-306325-ldn-b3.c.telia.net (2001:2000:3080:a4b::2)  3.323 ms  3.367 ms  3.368 ms
 8  2400:cb00:21:1024::a29e:998c (2400:cb00:21:1024::a29e:998c)  3.347 ms 2400:cb00:21:1024::a29e:9826 (2400:cb00:21:1024::a29e:9826)  3.457 ms 2400:cb00:21:1024::a29e:9808 (2400:cb00:21:1024::a29e:9808)  3.360 ms

And it seems like AS20860 has a shorter route to CloudFlare on IPv4 as well:

$ traceroute cloudflare.com
traceroute to cloudflare.com (198.41.214.163), 30 hops max, 60 byte packets
 1  *.*.*.* (*.*.*.*)  0.059 ms  0.029 ms  0.029 ms
 2  *.as20860.net (*.*.*.*)  14.854 ms  14.968 ms  15.055 ms
 3  340.core2.dc4.as20860.net (62.233.127.245)  3.455 ms  3.522 ms  3.671 ms
 4  300.core1.dc4.as20860.net (62.233.118.229)  3.584 ms  3.651 ms  3.707 ms
 5  330.core1.thn.as20860.net (62.233.127.241)  125.995 ms  126.009 ms  126.043 ms
 6  be99.asr01.thn.as20860.net (84.22.164.90)  3.795 ms  3.787 ms  3.743 ms
 7  linx-juniper.as13335.net (195.66.225.179)  3.317 ms  3.339 ms  3.358 ms
 8  198.41.214.163 (198.41.214.163)  3.375 ms  3.371 ms  3.375 ms

I have an other site on the 104.18.50.1 network that goes straight to CloudFlare's London proxies, just like cloudflare.com above.

As far as I can understand, some router at AS20860/iomart (be99.asr01.thn.as20860.net) is misbehaving here. But whom should I contact now to have it corrected?

I would appreciate any pointers on this matter.

Cheers,
Bence

P.S. tried to anonymise source IP addresses, hope I haven't overdone it

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#2 2015-11-03 05:40:11

Nyr
Trusted Member
Registered: 2013-03-04
Posts: 338

Re: AS20860 CloudFlare routing quirk?

You can contact iomart and they will contact CloudFlare if it's not at their edge.

But remember that you aren't a customer of them, so your mileage may vary.

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