IPv6 connection does not work in VPS on SolusVM OpenVZ 7 node

Symptoms

• IPv6 connection does not work in VPS on SolusVM OpenVZ 7 node:

  # ping6 ipv6.google.com
  PING ipv6.google.com(mia09s02-in-x0e.1e100.net) 56 data bytes
  From 2001:db8:f61:a1ff:0:0:0:80:: icmp_seq=1 Destination unreachable: Administratively prohibited
  From 2001:db8:f61:a1ff:0:0:0:80:: icmp_seq=2 Destination unreachable: Administratively prohibited

Cause

Default RHEL 7 ip6tables configuration that blocks IPv6 forwarding and inbound connections.

Resolution

1. Access affected OpenVZ 7 node via SSH.

2. Remove ip6tables rules that prevents connections:

   # ip6tables -D FORWARD -j REJECT --reject-with icmp6-adm-prohibited
   # ip6tables -D INPUT -j REJECT --reject-with icmp6-adm-prohibited