41 Network Statistics with Netstat

*Network Statistics with `netstat`* refers to using the `netstat` command to display various network-related statistics and information on a system. `netstat` provides details about active network connections, routing tables, interface statistics, and listening ports, which are crucial for diagnosing and troubleshooting network issues.

Key features of the `netstat` command include:

1. **Active Network Connections**:
Lists current connections, including the local and remote IP addresses, ports, and connection status (e.g., ESTABLISHED, LISTENING).
Example: `netstat -an` (shows all active connections)

2. **Listening Ports**:
Displays ports that are currently open and waiting for incoming connections. This is useful for identifying which services are accepting network traffic.
Example: `netstat -tuln` (shows TCP/UDP listening ports)

3. **Routing Table**:
Shows the system's routing table, which defines how packets are forwarded to different destinations.
Example: `netstat -r` (displays the routing table)

4. **Interface Statistics**:
Displays statistics for network interfaces, including the number of packets sent/received, errors, and collisions.
Example: `netstat -i` (shows interface statistics)

5. **Network Protocol Statistics**:
Provides detailed information about protocol-specific statistics (e.g., TCP, UDP).
Example: `netstat -s` (shows statistics for each protocol)

Although `netstat` is very helpful, it’s being gradually replaced by more modern tools like `ss` on many Linux systems, which provides similar functionality with improved performance and additional features.