Service custom NONE

Hello,

[sorry for the stupid question.. :) ]

The service NONE has these parametters (5.2.10) :

config firewall service custom edit "NONE" set visibility disable set tcp-portrange 0 next end

why the tcp-portrange is set ? with linux, when we specify to listen on port 0, it's a randomn port.. Is it better to unset tcp-portrange or leave it like that ?

Lucas