Hello, i have tested from one subnet in our local AS network and got result curl -4 'http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os' http://centos.vpsnet.lt/centos/7.2.1511/os/x86_64/ http://centos.mirror.serveriai.lt/7.2.1511/os/x86_64/ http://mirror.bacloud.com/centos/7.2.1511/os/x86_64/ http://mirror.duomenucentras.lt/centos/7.2.1511/os/x86_64/ http://mirror-pl.kielcetechnologypark.net/centos/7.2.1511/os/x86_64/ http://centos2.hti.pl/7.2.1511/os/x86_64/ http://ftp.prz.edu.pl/centos/7.2.1511/os/x86_64/ http://centos.slaskdatacenter.com/7.2.1511/os/x86_64/ http://centos.po.opole.pl/7.2.1511/os/x86_64/ http://mirror.onet.pl/pub/mirrors/centos/7.2.1511/os/x86_64/ everything looks fine test 2 for ipv6 curl -6 'http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os' curl: (7) couldn't connect to host ping6 mirrorlist.centos.org PING mirrorlist.centos.org(2a02:2498:1:3d:5054:ff:fed3:e91a) 56 data bytes ^C --- mirrorlist.centos.org ping statistics --- 5 packets transmitted, 0 received, 100% packet loss, time 3998ms ping6 ipv6.google.com PING ipv6.google.com(arn06s07-in-x0e.1e100.net) 56 data bytes 64 bytes from arn06s07-in-x0e.1e100.net: icmp_seq=1 ttl=56 time=13.9 ms ^C --- ipv6.google.com ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 13.958/13.958/13.958/0.000 ms these test was made from 91.211.244.0/22 and if ipv6 from 2a05:7cc0::1/32 our ipv6 is working correctly: ping6 2a05:7cc0::91:211:244:21 PING 2a05:7cc0::91:211:244:21(2a05:7cc0::91:211:244:21) 56 data bytes 64 bytes from 2a05:7cc0::91:211:244:21: icmp_seq=1 ttl=63 time=1.50 ms ^C --- 2a05:7cc0::91:211:244:21 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 1.501/1.501/1.501/0.000 ms test from other subnet: 185.34.52.0/22 curl -4 'http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os' http://mirrors.supportex.net/centos/7.2.1511/os/x86_64/ http://mirror.sitbv.nl/centos/7.2.1511/os/x86_64/ http://mirrors.noction.com/centos/7.2.1511/os/x86_64/ http://mirror.oxilion.nl/centos/7.2.1511/os/x86_64/ http://mirror.nl.webzilla.com/centos/7.2.1511/os/x86_64/ http://mirror.netrouting.net/centos/7.2.1511/os/x86_64/ http://ftp.nluug.nl/ftp/pub/os/Linux/distr/CentOS/7.2.1511/os/x86_64/ http://mirror.1000mbps.com/centos/7.2.1511/os/x86_64/ http://ftp.tudelft.nl/centos.org/7.2.1511/os/x86_64/ http://mirror.widexs.nl/ftp/pub/os/Linux/distr/centos/7.2.1511/os/x86_64/ On 2/24/2016 6:04 PM, Fabian Arrotin wrote: > curl -4 'http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os