The netstat is used for Network Monitoring and Troubleshooting. It stands for the Network Statistics. The netstat is a command-line network utility that displays:
- network connections for tcp, udp
- routing tables
- a number of network interface
- network protocol statistics
To identify no. of connection on a given port or IP.
Syntax: netstat -[OPTIONS]
Input: netstat -putan | grep <PORT/IP> where, t = tcp u = udp n = numerical addr l = listening ports p = PID
To see all the sockets
Syntax: netstat -a
To see all the TCP ports
Syntax: netstat -at
To see all the TCP v6 ports
Syntax: netstat -6at
TO list all the UDP ports
Syntax: netstat -au
To list all the listening ports
Syntax: netstat -l
TO view the numerical address
Syntax: netstat -ln
To view the routing table
Syntax: netstat -r
To view the PID of the programme of connection
Syntax: netstat -p
To check the no of connection from a specific IP address.
Syntax: netstat -an grep
To get the list of all the interface
Syntax: netstat -i
Which port a process is using?
Syntax: netstat -ap grep
How to see statistics by protocol?
Syntax: netstat -s