CentOS

-bash-4.1# ping6 ::1 -c 4
PING ::1(::1) 56 data bytes
64 bytes from ::1: icmp_seq=1 ttl=64 time=0.030 ms
64 bytes from ::1: icmp_seq=2 ttl=64 time=0.013 ms
64 bytes from ::1: icmp_seq=3 ttl=64 time=0.039 ms
64 bytes from ::1: icmp_seq=4 ttl=64 time=0.036 ms

--- ::1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3002ms
rtt min/avg/max/mdev = 0.013/0.029/0.039/0.011 ms

-bash-4.1# ping6 ipv6.google.com -c 4
PING ipv6.google.com(2800:3f0:4002:805::200e) 56 data bytes
From fe80::225:90ff:fe7b:b52a icmp_seq=1 Destination unreachable: Address unreachable
From fe80::225:90ff:fe7b:b52a icmp_seq=2 Destination unreachable: Address unreachable
From fe80::225:90ff:fe7b:b52a icmp_seq=3 Destination unreachable: Address unreachable
From fe80::225:90ff:fe7b:b52a icmp_seq=4 Destination unreachable: Address unreachable

--- ipv6.google.com ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 6014ms

my file /etc/sysconfig/network is:

NETWORKING=yes
HOSTNAME=ns507858.ip-192-99-5.net
NOZEROCONF=true
GATEWAY=94.23.2.254
NOZEROCONF=true
GATEWAY=192.99.5.254
NETWORKING_IPV6=yes



my ovh ipv6 range is: 2607:5300:60:3630::/64

what right ipv6 and ipv6 gateway, I need put in fille: /etc/sysconfig/network-scripts/ifcfg-eth0

Read /usr/share/doc/initscripts*/sysconfig.txt and look for the IPV6* entries you can add to the ifcfg file.

setup:

IPV6INIT=yes
IPV6ADDR=2607:5300:60:3630::1/64
IPV6_DEFAULTGW=2607:5300:60:3630::1

And this:

IPV6INIT=yes
IPV6ADDR=2607:5300:60:3630::1/64
IPV6_DEFAULTGW=2607:5300:60:3630::2

but both show this:

-bash-4.1# ping6 ipv6.google.com -c4
PING ipv6.google.com(2800:3f0:4002:805::200e) 56 data bytes
From 2607:5300:60:3630::1 icmp_seq=1 Destination unreachable: Address unreachable
From 2607:5300:60:3630::1 icmp_seq=2 Destination unreachable: Address unreachable
From 2607:5300:60:3630::1 icmp_seq=3 Destination unreachable: Address unreachable
From 2607:5300:60:3630::1 icmp_seq=4 Destination unreachable: Address unreachable

--- ipv6.google.com ping statistics ---
4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 2999ms

-bash-4.1# ifconfig |grep inet6
inet6 addr: 2607:5300:60:3630::1/64 Scope:Global
inet6 addr: fe80::225:90ff:fe7b:b52a/64 Scope:Link
inet6 addr: ::1/128 Scope:Host

-bash-4.1# ping6 2607:5300:60:3630::1 -c4
PING 2607:5300:60:3630::1(2607:5300:60:3630::1) 56 data bytes
64 bytes from 2607:5300:60:3630::1: icmp_seq=1 ttl=64 time=0.025 ms
64 bytes from 2607:5300:60:3630::1: icmp_seq=2 ttl=64 time=0.037 ms
64 bytes from 2607:5300:60:3630::1: icmp_seq=3 ttl=64 time=0.043 ms
64 bytes from 2607:5300:60:3630::1: icmp_seq=4 ttl=64 time=0.023 ms

--- 2607:5300:60:3630::1 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3003ms
rtt min/avg/max/mdev = 0.023/0.032/0.043/0.008 ms

would not it be a firewall block? ip6tables

Follow this guide
https://www.reliablesite.net/hosting-ne ... sAJ3IjwaUk

but not work

not ping in ipv6.google.com

but ping in local ip 2607:5300:60:3630::1 and works

I try ping6 to 2607:5300:60:3630::1 from website ping6 tool but not works

I just realised, this is OVH and they do really weird stuff. You need to ask them as the setup is peculiar to them.