Master Linux Network Management with the Powerful ‘ip’ Command

Check Current Network Information

Before using ip, you need to view the current network details. The command ip addr show displays each interface with its IP address, MAC address, broadcast address, and subnet mask. Example output shows the loopback interface and an Ethernet interface (eth0) with their respective configurations.

Configure Network Interface

After understanding the existing configuration, you can modify interfaces using various ip sub‑commands:

Set an IP address: sudo ip addr add 192.168.1.100/24 dev eth0

Set the default gateway: sudo ip route add default via 192.168.1.1

Configure a DNS server: sudo echo "nameserver 8.8.8.8" > /etc/resolv.conf

Bring an interface up or down: sudo ip link set eth0 up and sudo ip link set eth0 down

Network Troubleshooting

The ip command also assists in diagnosing network problems. Common troubleshooting commands include:

Check whether an interface is connected: sudo ip link show <interface_name>

Show interface speed and traffic statistics: sudo ip -s link show <interface_name>

Display the routing table: sudo ip route show

List all assigned IP addresses: sudo ip addr | grep inet

Conclusion

The ip command provides comprehensive control over Linux networking, allowing you to inspect interfaces, assign IP addresses, set gateways, configure DNS resolvers, and troubleshoot connectivity. While this article covers essential commands, many additional options are documented in the manual page ( man ip) for deeper exploration.