pfSense

With current implementation of pfSenses "DHCPv6 Prefix Delegation size" dropdown selection it's impossible to match the DHCP's server reported prefix as it only allows a limited set of prefixes.
This will further on render the tracking interfaces to be unable to get a IPv6 address assigned.

The following patch will introduce additional selections to that prefix delegation size:

--- interfaces.php 2019-06-17 14:38:09.905894000 0200
++ interfaces.php-new 2019-06-17 14:41:21.146144000 0200
@ -2387,7 +2387,7 @
'dhcp6-ia-pd-len',
'DHCPv6 Prefix Delegation size',
$pconfig['dhcp6-ia-pd-len'],
- array("none" => "None", 16 => "48", 12 => "52", 8 => "56", 4 => "60", 3 => "61", 2 => "62", 1 => "63", 0 => "64")
array("none" => "None", 16 => "48", 15 => "49", 14 => "50", 13 => "51", 12 => "52", 11 => "53", 10 => "54", 9 => "55", 8 => "56", 7 => "57", 6 => "58", 5 => "59", 4 => "60", 3 => "61", 2 => "62", 1 => "63", 0 => "64")
))->setHelp('The value in this field is the delegated prefix length provided by the DHCPv6 server. Normally specified by the ISP.');