#1 2018-04-28 13:58:04

isaac
Trusted Member
Registered: 2018-04-28
Posts: 3

IPv6 routing - UK - outbound routed thru HE/Cogent exclusively

Hey!

I am using the UK location (xxx.100.xxx) and my v6 IP is from the 2a04:92c0::/29 range.

I think outbound routes are a little bit weird. In particular, although NTT/Telia/GTT are upstream providers (as indicated by announcing the said v6 prefix), they are not used in outbound traffic.

Here is an example traceroute, where traffic to NTT is routed through HE:

[email protected]:~# traceroute -q1 -6 www.ntt.net
traceroute to www.ntt.net (2606:2800:233:bdc:d01:1716:18e:1dcc), 30 hops max, 80 byte packets
 1  2a04:92c7:e:17:: (2a04:92c7:e:17::)  0.256 ms
 2  2a04:92c1:1:7::13 (2a04:92c1:1:7::13)  0.482 ms
 3  *
 4  40ge1-3.core1.lon2.he.net (2001:7f8:4::1b1b:1)  14.717 ms
 5  *
 6  2606:2800:50a1:f::2 (2606:2800:50a1:f::2)  5.000 ms
 7  2606:2800:233:bdc:d01:1716:18e:1dcc (2606:2800:233:bdc:d01:1716:18e:1dcc)  4.268 ms

And traffic to Telia:

[email protected]:~# traceroute -q1 2001:2000:3018:94::1
traceroute to 2001:2000:3018:94::1 (2001:2000:3018:94::1), 30 hops max, 80 byte packets
 1  2a04:92c7:e:17:: (2a04:92c7:e:17::)  0.226 ms
 2  2a04:92c1:1:7::13 (2a04:92c1:1:7::13)  0.461 ms
 3  *
 4  40ge1-3.core1.lon2.he.net (2001:7f8:4::1b1b:1)  29.680 ms
 5  100ge6-2.core1.ams1.he.net (2001:470:0:2d0::2)  21.736 ms
 6  adm-sara-s1-link.telia.net (2001:2000:3080:1b9::1)  9.053 ms
 7  adm-bb3-v6.telia.net (2001:2000:3019:65::1)  8.798 ms
 8  2001:2000:3019:7b::1 (2001:2000:3019:7b::1)  39.128 ms
 9  ldn-b1-v6.telia.net (2001:2000:3018:94::1)  9.970 ms

Last edited by isaac (2018-04-28 14:02:38)

Offline

#2 2018-04-28 16:52:50

thvmh
Trusted Member
Registered: 2018-04-04
Posts: 18

Re: IPv6 routing - UK - outbound routed thru HE/Cogent exclusively

This is because bgp makes it's own decision about which route is chooses. Apperently this one is better according to bgp.

Offline

#3 2018-04-30 09:06:34

mannen
Trusted Member
Registered: 2014-11-11
Posts: 75

Re: IPv6 routing - UK - outbound routed thru HE/Cogent exclusively

HE IPv6 traffic is generally free/very cheap whereas the other ones are usually paid/more expensive.

Offline

Board footer

Powered by FluxBB