While oing apt-get requests to mirror.wikimedia.org / apt.wikimedia.org there is a notable speed difference between IPv4 and IPv6. My ISP is Proxad AS12322, routing over Zayo to reach eqiad. I guess there is less bandwith for IPv6 along the way or something throttle it -might be my ISP-.
Lame tests:
IPv4 fast
$ wget -4 https://apt.wikimedia.org/wikimedia/incoming/jenkins_1.625.2_all.deb
vvvvvvvv
jenkins_1.625.2_all 100%[=====================>] 59.63M 17.3MB/s in 5.2s
^^^^^^^^IPv6 slow
$ wget -6 https://apt.wikimedia.org/wikimedia/incoming/jenkins_1.625.2_all.deb
vvvvvvv
jenkins_1.625.2_all 100%[=====================>] 59.63M 368KB/s in 2m 58s
^^^^^^^Trace:
$ traceroute -4 -q 1 -A apt.wikimedia.org traceroute to apt.wikimedia.org (208.80.154.10), 30 hops max, 60 byte packets 1 Freebox-Server.local (192.168.2.254) [*] 0.156 ms 2 sch44-2-88-190-13-254.fbxo.proxad.net (88.190.13.254) [AS12322] 1.470 ms 3 78.255.108.126 (78.255.108.126) [AS12322] 1.145 ms 4 nantes-6k-1-v802.intf.nro.proxad.net (78.254.243.173) [AS12322] 1.418 ms 5 nantes-crs8-2-be1003.intf.routers.proxad.net (194.149.161.177) [AS12322] 3.047 ms 6 p11-crs16-1-be1110.intf.routers.proxad.net (194.149.162.109) [AS12322] 11.074 ms 7 th2-9k-3-be1001.intf.routers.proxad.net (194.149.162.86) [AS12322] 7.880 ms 8 ae2.mpr1.cdg11.fr.zip.zayo.com (64.125.14.37) [*] 7.598 ms 9 ae27.cs1.cdg11.fr.eth.zayo.com (64.125.29.4) [*] 83.823 ms 10 * 11 ae5.cs2.lga5.us.eth.zayo.com (64.125.29.93) [*] 83.776 ms 12 ae0.cs1.lga5.us.eth.zayo.com (64.125.29.186) [*] 83.775 ms 13 ae4.cs1.dca2.us.eth.zayo.com (64.125.29.203) [*] 83.771 ms 14 ae27.cr1.dca2.us.zip.zayo.com (64.125.30.247) [*] 82.748 ms 15 * 16 64.125.192.142.IPYX-125449-001-ZYO.zip.zayo.com (64.125.192.142) [*] 103.321 ms 17 *
$ traceroute -6 -q 1 -A apt.wikimedia.org traceroute to apt.wikimedia.org (2620:0:861:1:208:80:154:10), 30 hops max, 80 byte packets 1 2a01:e35:8be0:d0d0::1 (2a01:e35:8be0:d0d0::1) [AS12322] 0.245 ms 2 * 3 2a01:e00:18::32 (2a01:e00:18::32) [AS12322] 8.135 ms 4 2001:438:ffff::407d:e25 (2001:438:ffff::407d:e25) [*] 7.984 ms 5 ae27.cs1.cdg11.fr.eth.zayo.com (2001:438:ffff::407d:1d04) [*] 84.060 ms 6 * 7 ae5.cs2.lga5.us.eth.zayo.com (2001:438:ffff::407d:1d5d) [*] 84.592 ms 8 ae0.cs1.lga5.us.eth.zayo.com (2001:438:ffff::407d:1dba) [*] 85.295 ms 9 ae4.cs1.dca2.us.eth.zayo.com (2001:438:ffff::407d:1dcb) [*] 83.829 ms 10 ae27.cr1.dca2.us.zip.zayo.com (2001:438:ffff::407d:1ef7) [*] 83.351 ms 11 ae6.er1.iad10.us.zip.zayo.com (2001:438:ffff::407d:1476) [*] 85.407 ms 12 2001:438:fffd:58::2 (2001:438:fffd:58::2) [*] 88.531 ms 13 *
I have the same behavior on either apt.wikimedia.org (carbon) or mirrors.wikimedia.org (sodium).