The management tool of Linux network performance Three Musketeers This article is an introduction to managing Linux viewing ports, which displays the outgoing headers from each packet and the address from host hostname to port 80.
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
So we know that port 7710 belongs to the SSHD program.
Linux view port usage status and startup