If UDP is selected as a protocol when specifying a rule, the additional fields shown in the following figure appear at the bottom of the screen.Firewall Configuration “Add Rule” and “Edit Rule” UDP Protocol Fields
A source or destination port number for filtering in the “Source Port” or “Destination Port” field.A source or destination port number for filtering in the “Source Port” field. If a second number is entered the “to” field, TCP packets are filtered for any port number within the range that starts with the first port number and that ends with the second.