Netstat Command in Linux
NetStat (Networking Statistics) is a command-line tool for monitoring network connections both incoming and outgoing as well as viewing routing tables, network statistics, etc.
Usage of netstat:
1. Listing all the LISTENING PORTS of TCP and UDP:
Listing all the Listening ports (both TCP and UDP) can be done using the netstat -a command.
2. Listing all the PORTS of the only TCP:
To list only the TCP port connections, netstat -at is used.
3. Listing all the PORTS of the only UDP:
To list only the TCP port connections, netstat -au is used.
4. Listing all the existing LISTENING CONNECTIONS:
To list all the listening ports, netstat -l is used.
5. Listing all the LISTENING PORTS of the only TCP:
To list all the listening ports under TCP, netstat -lt is used.
6. Listing all the LISTENING PORTS of the only UDP:
To list all the listening ports under UDP, netstat -lu is used.
7. Listing all the LISTENING PORTS of the only UNIX:
To list all the listening ports of UNIX, netstat -lx is used.
8. Showing Statistics by PROTOCOL:
To show the network statistics for each protocol, the netstat -s command is used.
9. Showing Statistics by TCP PROTOCOL:
To show the network statistics for TCP protocol, the netstat -st command is used.
10. Showing Statistics by UDP PROTOCOL:
To show the network statistics for UDP protocol, the netstat -su command is used.
11. Displaying IPv4 and IPv6 information:
To display the IPv4 and IPv6 information of the network, the netstat -g command is used.
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