Netstat

Netstatis a command to displays network statistics. Netstat is at least available in AIX, Linux, macOS and Windows

• Package: net-tools

Linux Examples

• netstat -vatunp or netstat -lnpt. See also: ss -ap, ss -ta and lsof

-l show only listening sockets
-p --program Show the PID and name (PID/name) of the program to which each socket belong
-t --tcp

• netstat -vatunp

-v --verbose
-a --all

• netstat -tn or netstat --tcp -n (TCP connections)
• netstat -rn IP routes

• Display statistics by protocol: netstat -s

macOS Examples

• netstat -ap tcp
  • netstat -ap tcp | grep LISTEN

See also

• Script to use if netstat not available
• fuser
• ip [link, route], ifconfig netstat ss lsof ping ethtool mii-tool arping nmcli(RHEL) route networkctl, netplan, tc
• Ethernet: MII, MDI, bonding, etherchannel, STP, ARP, MAC, STP, Jumbo frames, 802.1X, MTU, Ethernet In-Band Access (IBA), LACP, Multicast, Broadcast, SPI
• show routing route (PAN-OS)

http://man7.org/linux/man-pages/man8/netstat.8.html

https://unix.stackexchange.com/a/9254

https://unix.stackexchange.com/a/9254