Messages

And I am running 18.7

I am having the same issue.

There appears to be a bug in the UI code.
  That is, I can manually put a /64 after the tunnel-local-addr, like this:
      <tunnel-local-addr>2001:XX:XX:XX::2/64</tunnel-local-addr>
  in /conf/config.xml

And if I immediately restart, and go to Interfaces->other-GIF0 and click edit,
2001:XX:XX:XX::2/64 appears in the "GIF Tunnel Local Address" web field.

If I click "Save", I get the red banner of input error:

The following input errors were detected:
    The tunnel local and tunnel remote fields must have valid IP addresses.

So, I leave it as I manually input into config.xml (i.e. don't save)
And I still get a prefixlen of 128:

AND That's OK, when I look back at the tunnelbroker documentation for FreeBSD.
So It's just the UI issue.  And a manual edit of config.xml is a workaround.

#ifconfig gif0
gif0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu 1280
   options=80000<LINKSTATE>
   tunnel inet 207.XXX.XXX.21 --> 216.66.22.2
   inet6 2001:XXX:XXX:XXX::2 --> 2001:XXX:XXX:XXX1e::1  prefixlen 128
   inet6 fe80::20c:xxxx:xxxx:xxxx%gif0 prefixlen 64 scopeid 0xa
   nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
   groups: gif


Cheers!
-sam