Check Current Connections

Check the number of connections/sockets in a given state. Uses iproute2's ss tool to retrieve connections. Options: -s State of connection (def: all) (established, syn-sent, syn-recv, fin-wait-1, fin-wait-2, time-wait, closed, close-wait, last-ack, listen, and closing) -f Apply quoted ss expression filter e.g. '( dst 192.168.1/24 and dport >= :1024 )' -p Set protocol or family type (udp/tcp/inet/inet6) -c Critical threshold as an integer -w Warning threshold as an integer ########## # Example: # ########## # 1.) Critical if more than 1000 connections to port 443 are in the TCP ESTABLISHED state. # $ ./check_connections.sh -s established '( sport = :443 )' -w 800 -c 1000

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