Common
IP header
Supplemental data in an IP packet
IP header
An IP header is header information at the beginning of an Internet Protocol (IP) packet. An IP packet is the smallest message entity exchanged via the Internet Protocol across an IP network. IP packets consist of a header for addressing and routing and a payload for user data. The header contains information about IP version, source IP address, destination IP address, time-to-live, etc. The payload of an IP packet is typically a datagram or segment of the higher-level transport layer protocol, but may be data for an internet layer (e.g., ICMP or ICMPv6) or link layer (e.g., OSPF) instead. Two different versions of IP are used in practice today: IPv4 and IPv6. The IPv6 header uses IPv6 addresses and thus offers a much bigger address space but is not backward compatible with IPv4.
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