Resolved Problem with assigning IPv6 to new server

[VojinP]

I have purchased new Centos 8 server without IPv6 support. Since I needed IPv6, they have added it. When I checked ip a I got:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 02:00:82:33:b4:3c brd ff:ff:ff:ff:ff:ff
    inet xxx.xx.xxx.xx/24 brd xxx.xx.xxx.xxx scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::82ff:fe33:b43c/64 scope link
       valid_lft forever preferred_lft forever

and sysctl -a | grep ipv6.*disable :

net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.all.disable_policy = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.default.disable_policy = 0
net.ipv6.conf.eth0.disable_ipv6 = 0
net.ipv6.conf.eth0.disable_policy = 0
net.ipv6.conf.lo.disable_ipv6 = 0
net.ipv6.conf.lo.disable_policy = 0

so it looks all is OK with IPv6. However when I try to reread IP addresses, got nothing, and when want manually to add one, fe80::82ff:fe33:b43c/64, I got following message:

The specified IP address cannot be used on network interface. You need to specify a valid IP address with subnet prefix range or mask.

Any ide why and how to fix that?

 

[IgorG]

CentOS 8 is using NetworkManager. The NetworkManager is not supported in Plesk, and it is recommended to disable this component. I think this may be a reason for this issue.

 

[VojinP]

I have disabled NetworkManager, but problem persists.

 

[VojinP]

I have tried to ping that IPv6 and it looks it is working, but not in plesk yet...

[root@scala ~]# ping6 fe80::82ff:fe33:b43c
PING fe80::82ff:fe33:b43c(fe80::82ff:fe33:b43c) 56 data bytes
64 bytes from fe80::82ff:fe33:b43c%eth0: icmp_seq=1 ttl=64 time=0.145 ms
64 bytes from fe80::82ff:fe33:b43c%eth0: icmp_seq=2 ttl=64 time=0.068 ms
64 bytes from fe80::82ff:fe33:b43c%eth0: icmp_seq=3 ttl=64 time=0.074 ms
64 bytes from fe80::82ff:fe33:b43c%eth0: icmp_seq=4 ttl=64 time=0.100 ms

 

[VojinP]

Hmm.. it looks it was problem with network configuration. Just edited it and it works now like a charm.