Check tcp

/usr/lib/nagios/plugins/check_tcp -H 127.0.0.1 -p 80

 /usr/lib/nagios/plugins/[[check_tcp]] -H 127.0.0.1 -p 80
 TCP OK - 0.000 second response time on 127.0.0.1 port 80|time=0.000274s;;;0.000000;10.000000

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
• Nagios, NRPE, Nagios Cross-Platform Agent (NCPA), nagios.cfg, nrpe, nagios4, nagios3, nagios3stats, check_http, Monitoring-plugins, /usr/lib/nagios/plugins/, Nagios logs, nagios.cfg