Linux View port Usage

Linux View port Usage-houying-Blog channel-csdn.net

-bash-3.00# netstat-tln

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The NETSTAT-TLN command is used to view the port usage of Linux
　
/etc/init.d/vsftp start is used to start the FTP port!
　
See File/etc/services
　
Netstat
　
To view connected service ports (established)
　
Netstat-a
　
View all service ports (listen,established)
　
sudo netstat-ap
　
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
　
Shows that this server has 7710 ports open, so 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)
　
In this way, we know that the 7710 port belongs to the SSHD program.

Linux View port Usage