User Datagram Protocol (UDP)

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wikipedia:User Datagram Protocol

• DHCP 68
• Kerberos UDP 88
• Internet Key Exchange (IKE) 500
• syslog 514
• WireGuard use UDP port 41414
• GlobalProtect use UDP 4501

https://unix.stackexchange.com/a/266368 Can show wrong information

nc -vnzu  5x.253.51.xxx 4501
Connection to 5x.253.51.xxx 4501 port [udp/*] succeeded!

Related terms

• Transmission Control Protocol (TCP)
• netstat
• nc -u XXXXX
• wikipedia:UDP hole punching
• PAN-OS: show session info: UDP default timeout: 30 secs
• set session timeout-udp 60 (change is not persistent)
• Flood protection

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

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