Description: This filter protocol object matches the Internet Protocol Number in the packets. These IP numbers are defined in the Network Working Group Request for Comments (RFC) documents. For example, Cisco commonly used protocol includes: 1 - Internet Control Message Protocol 2 - Internet Gateway Message Protocol 4 - IP in IP tunneling 6 - Transmission Control Protocol 9 - Cisco's IGRP routing protocol 17 - User Datagram Protocol 47 - Cisco's GRE tunneling 50 - Encapsulation Security Payload 51 - Authentication Header Protocol 88 - Cisco's EIGRP routing protocol 89 - OSPF routing protocol 94 - KA9Q NOS compatible IP over IP tunneling 103 - Protocol Independent Multicast 108 - Payload Compression Protocol Setting this object to '-1' will make the filtering match any IP number.