The IP protocol to which this rule applies. The protocol type is required
when creating a firewall rule. This value can either be one of the
following well known protocol strings (tcp, udp, icmp, esp, ah, ipip,
sctp) or the IP protocol number.
An optional list of ports to which this rule applies. This field is only
applicable for the UDP or TCP protocol. Each entry must be either an
integer or a range. If not specified, this rule applies to connections
through any port. [...]