Class Protocol (1.19.0)

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IANA Internet Protocol Number such as TCP(6) and UDP(17).

Values: PROTOCOL_UNSPECIFIED (0): Unspecified protocol (not HOPOPT). ICMP (1): Internet Control Message Protocol. TCP (6): Transmission Control Protocol. UDP (17): User Datagram Protocol. GRE (47): Generic Routing Encapsulation. ESP (50): Encap Security Payload.