ss
ss list out all connections. ss -t tcp only. ss -u udp only. ss -x unix only. ss -a -A udp report both "CONNECTED" and "LISTENING" sockets udp ss -nt tcp with hostnames not resolved. ss -ltn listening sockets only, tcp with hostnames not resolved. ss -pnt tcp with hostnames not resolved, associated process id's using connection. <- very useful ss -s summary statistics
netstat
netstat -natp show active Internet connections netstat -tupn
View established connections and associated programs
sudo netstat -atupen | grep ESTABLISHED netstat -nputw
continuously updated
netstat -nputwc
tcpdump
tcpdump -X -i eth0
lsof
View established connections and associated programs type TCP only
sudo lsof -nP -iTCP -sTCP:ESTABLISHED
ethtool
To get information about your Ethernet interface, you can use:
ethtool eth0
Replace eth0 with your actual interface name.
iftop
iftop is a real-time console-based network bandwidth monitoring tool.
sudo iftop