[CentOS-mirror] Unreachable IPv6 backbone mirror

Thu Jun 2 13:01:21 UTC 2016
Fabian Arrotin <arrfab at centos.org>

On 02/06/16 10:23, Sascha Spreitzer wrote:
> 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
> 

Hi Sacha,

Yes, there was an issue on that node wrt ipv6 connectivity but it will
be back with a different address in the dns backend soon. I'm also
working on a dynamic backend for the geoip dns setup so that our
monitoring solution (zabbix) will be able to remove/add automatically
those nodes, based on tests results for ipv4/ipv6 and other potential
issues.

Thanks for the report !

Cheers,

-- 
Fabian Arrotin
The CentOS Project | http://www.centos.org
gpg key: 56BEC54E | twitter: @arrfab

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