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Turns out I had misclicked the Prefix Delegation size under DHCPv6 client configuration for the WAN interface.

I set it to match the actual /56 delegation size and changed the IPv6 Configuration Type on the LAN interface back to Track Interface and IPv6 routing is working again.

I tried each of these floating rules to allow any type of IPV6-ICMP in on the WAN interface to no avail.

Protocol   Source   Port   Destination   Port   Gateway   Schedule                 
        IPv6 IPV6-ICMP   ! LAN net   *   LAN net   *   *   *   1         
        IPv6 IPV6-ICMP   ! LAN net   *   WAN address   *   *   *   1
        IPv6 IPV6-ICMP   *   *   *   *   *   *   1

I have the automatically generated rules.

Protocol   Source   Port   Destination   Port   Gateway   Schedule      Description       
     IPv6 IPV6-ICMP   *   *   *   *   *   *   *   IPv6 RFC4890 requirements (ICMP)   
     IPv6 IPV6-ICMP   (self)   *   fe80::/10,ff02::/16   *   *   *   *   IPv6 RFC4890 requirements (ICMP)   
     IPv6 IPV6-ICMP   fe80::/10   *   fe80::/10,ff02::/16   *   *   *   *   IPv6 RFC4890 requirements (ICMP)   
     IPv6 IPV6-ICMP   ff02::/16   *   fe80::/10   *   *   *   *   IPv6 RFC4890 requirements (ICMP)   
     IPv6 IPV6-ICMP   ::   *   ff02::/16   *   *   *   *   IPv6 RFC4890 requirements (ICMP)

Pretty simple setup but after changing ISP I cannot route IPv6 anymore. I have tried various combinations of IPv6 settings without much success. I am much more familiar with IPv4 networking than IPv6 though.

I am getting delegated 2606:83c0:1001:2500::/56 from the ISP so I used the first /64 to setup DHCPv6. All of my devices are on one flat network and they can communicate with each other via IPv6. I have a firewall rule to allow any outbound IPv6 traffic. Ping6 from the router is successful, but if I try to reach the same address from inside the network it fails.


WAN IPv6 info:

IPv6 link-local   fe80::7e2b:e1ff:fe13:c611/64
IPv6 address   2606:83c0:1c00::cb/128
IPv6 delegated prefix   2606:83c0:1001:2500::/56
IPv6 gateway   auto-detected: fe80::10ff

Route info:

ipv4   default   162.81.16.1   UGS   NaN   1500   igc1   wan
ipv6   default   fe80::10ff%igc1   UG   NaN   1500   igc1   wan
ipv6   2606:83c0:1001:2500::/56   ::1   UGSB   NaN   16384   lo0   Loopback
ipv6   2606:83c0:1001:2500::1   link#1   UHS   NaN   16384   lo0   Loopback

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