[CentOS-mirror] Unreachable IPv6 backbone mirror

Thu Jun 2 08:23:41 UTC 2016
Sascha Spreitzer <sspreitz at redhat.com>

Hi

From my end (Zurich, CH) of the internet can not reach one of the IPv6
backbone mirrors.

[..]
[root at mirror ~]# /usr/bin/rsync -6avzH --delete msync.centos.org::CentOS
/var/www/html/centos
rsync: failed to connect to msync.centos.org
(2001:1af8:4060:a006:223:7dff:feaa:426f): Connection timed out (110)
rsync error: error in socket IO (code 10) at clientserver.c(122)
[Receiver=3.0.9]
[..]

[..]
[root at mirror ~]# mtr -nr 2001:1af8:4060:a006:223:7dff:feaa:426f
Start: Thu Jun  2 08:20:11 2016
HOST: mirror                      Loss%   Snt   Last   Avg  Best  Wrst StDev
  1.|-- 2a02:168:7a0e:5::1         0.0%    10    0.2   0.2   0.1   0.2   0.0
  2.|-- 2a02:168:2000:1d::1        0.0%    10    0.5   0.6   0.5   0.9   0.0
  3.|-- 2001:1620:2::1cd           0.0%    10    0.5   1.7   0.5  12.0   3.5
  4.|-- 2001:1620:2::1ad           0.0%    10    0.8   0.7   0.6   1.0   0.0
  5.|-- 2001:1620:2::196           0.0%    10    0.7   1.8   0.7   8.0   2.2
  6.|-- 2001:1620:2::159           0.0%    10    0.5   2.0   0.5   7.4   2.4
  7.|-- 2001:1620:2::c5            0.0%    10    6.1   7.5   0.5  23.1   7.1
  8.|-- 2001:1620:2::2b6           0.0%    10    6.0   6.0   5.8   7.6   0.5
  9.|-- 2001:1620:2::dd            0.0%    10   16.4  16.5  16.4  17.0   0.0
 10.|-- 2001:1620:1000::15e        0.0%    10   19.6  19.9  17.9  21.3   0.9
 11.|-- 2a03:2280:38::23           0.0%    10   17.4  17.6  17.4  17.8   0.0
 12.|-- 2001:1af8:4060:0:81:17:32  0.0%    10  102.3  45.6  17.2 214.8  65.1
 13.|-- ???                       100.0    10    0.0   0.0   0.0   0.0   0.0
[..]

PS.: If in the case that endpoint is firewalled, please mind that ICMPv6
is a vital part of the IPv6 protocol and shall not be dropped but rather
be answered accordingly (rejected, prohibited, etc..)
This is part of the IPv6 RFC.

Kind regards
Sascha

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