LINUX Note-netstat command

The netstat command is used to display statistics related to IP, TCP, UDP, and ICMP protocols, and is typically used to verify the network connectivity of each port on the machine. Netstat is a program that accesses the network and related information in the kernel, and it provides reports on TCP connections, TCP and UDP snooping, and process memory management.

Netstat parameters, although a lot, but often not much, mainly the following several parameters:

Netstat-[ATUNLP]

• -a:all, indicating that all connections, service monitoring, socket data are listed
• -T:TCP, listing services for the TCP protocol
• -U:UDP, listing services for UDP protocol
• -n:port number, which is displayed using the port
• -l:listening, list the current listening service
• -p:program, list the PID of the service program

LINUX Note-netstat command