PfSense 2.3.4 - IPv6 gateway edit error

  • Today, I wanted to make a change to the running config on my pfSense box VM; it's been upgraded over time from 2.3.1 through 2.3.4, and when I went to change an IPv6 default gateway, it popped this little notice when clicking Save without making any changes to the Edit Gateway page:

    The following input errors were detected:
    The gateway address xxxx:xxxx:xxxx:ba8::1 does not lie within one of the chosen interface's subnets.

    Problem is that is indeed the interface subnet (This is on a GIF tunnel with
    Interface IPv6 subnet: xxxx:xxxx:xxxx:ba8::2/64.

    However in the actual underlying config, I see this:
    On the CLI login welcome screen:

     HENETV6_US (opt6) -> gif0       -> v6: xxxx:xxxx:xxxx:ba8::2/128

    and ifconfig gif0:

    gif0: flags=8051 <up,pointopoint,running,multicast>metric 0 mtu 1280
            options=80000 <linkstate>tunnel inet xx.xx.xx.xx -->
            inet6 xxxx:xxxx:xxxx:ba8::2 --> xxxx:xxxx:xxxx:ba8::1 prefixlen 128 
            inet6 fe80::20c:29ff:feba:cb9e%gif0 prefixlen 64 scopeid 0x11 
            nd6 options=21 <performnud,auto_linklocal></performnud,auto_linklocal></linkstate></up,pointopoint,running,multicast> 

    Notice the /128 netmask?!  If the web gui is checking the actual interface netmask as opposed to the config entered into the Interface screen, then I can understand why this is failing.

    Anyone experience this?

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