Linux view port usage status and startup

NETSTAT-TLN command is Linux view port usage

/etc/init.d/vsftp start is used to start the FTP port!

See File/etc/services

Netstat

Linux View Ports View connected service ports (established)

Netstat-a

Linux View Port View all service ports (listen,established)

sudo netstat-ap

Linux View Port View all service ports and display the corresponding service program name

Nmap Scan type >< scan parameters

For example:

Nmap localhost

Nmap-p 1024-65535 localhost

Nmap-pt 192.168.1.127-245

When we use NETSTAT-APN to view the network connection, we find a lot of things like the following:

Proto recv-q send-q Local address Foreign address State Pid/program Name

TCP 0 218.104.81.152:7710 211.100.39.250:29488 established 6111/1

Show this open 7710 port, then which program does this port belong to? We can use the Lsof-i: 7710 command to query:

COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME

SSHD 1990 Root 3u IPv4 4836 TCP *:7710 (LISTEN) Network Management Alliance

In this way, we know that the 7710 port belongs to the SSHD program.

Linux view port usage status and startup