ubnt@ubnt:~$ configure
[edit]
ubnt@ubnt# delete port-forward hairpin-nat
[edit]
ubnt@ubnt# delete port-forward auto-firewall
[edit]
ubnt@ubnt# commit
[edit]
ubnt@ubnt# save
Saving configuration to '/config/config.boot'...
Done
[edit]
ubnt@ubnt# exit
exit
ubnt@ubnt:~$ grep hairpin /config/config.boot
    hairpin-nat enable
ubnt@ubnt:~$