OPNSense IP Fail-over and IPv6 on ESXi (DHCPv6 flood)


I have an issue configure a PFSense firewal on an ESXi with an IP Failover.

I have followed all these points:

  • Create one /56 block on online.net console
  • Create 2 x /64 subnets from it
  • On WAN interface, configure the DUID from the /56 block and add one ipv6 from the first /64 (with this howto
  • On LAN interface, add one ipv6 from the second /64 with IPv6 Configuration Type = Static IPV6
  • On DHCPv6 nothing (unused)
  • On Router Advertisements , choose “ Unmanaged ” and set DNS servers (google : 2001:4860:4860::8844 & 2001:4860:4860::8888)

And the result I amm blocked/nulrouted systematically, because of a DHCPv6 flood !!!

Is there somebody who can help me ?
Thanks in advance…