Optional. An optional list of ports to which this rule applies. This field
is only applicable for the UDP or (S)TCP protocols. Each entry must be
either an integer or a range including a min and max port number.
The IP protocol this rule applies to. This value can either be one of the
following well known protocol strings (TCP, UDP, ICMP, ESP, AH, IPIP, SCTP)
or a string representation of the integer value.