This is a quick reference on how to show established tcp connections using the netstat command on Linux Based Operating Systems.
root@GNS3-Server:~# netstat Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 172.16.253.1:3080 172.16.253.1:43486 ESTABLISHED tcp 0 0 172.16.253.1:43486 172.16.253.1:3080 ESTABLISHED tcp 0 0 10.0.125.10:ssh 184.108.40.206:59675 ESTABLISHED
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