When adding ip aliases on top of carp not in the subnet of the carp configured address but an ip alias of the real interface do not error out but accept this as a valid configuration.
Catch a validation issue reported on the mailing list thread: IPv6 address data validation from: Brian Candler. It prevents putting a subnet in the address field since it then breaks the whole filter generation process
Properly set the configuration here based on https://forum.pfsense.org/index.php/topic,68531.0.html
Fix symlink calls adding full link name, it fixes issue reported at https://forum.pfsense.org/index.php/topic,72405.0.html