5-Tuple

The tuple (source IP address, source port, destination IP address, destination port, transport protocol). A 5-tuple

     uniquely identifies a UDP/TCP session.  When a UDP/TCP session
     flows through a NAT64, each session has two different 5-tuples:
     one with IPv4 addresses and one with IPv6 addresses.

See also

• TCP/IP, Transport protocol, UDP, SCTP, QUIC, subnet mask, Routing protocols: BGP, routing table, Policy based routing, multicast, TCP Fast Open, RDP, TTL, RTT, MPTCP, Large send offload (LSO): (TSO, GRO, GSO, TCP checksum), ethtool, SCTP, 5-Tuple, Check TCP connectivity, TCP window size, /proc/sys/net/ipv4/tcp_rmem, ack, List of TCP ports, localhost, broadcast address