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ip – Network Configuration Tool

The ip command is a powerful network configuration tool that allows you to configure network interfaces, routing tables, and more on Linux systems. It is a part of the iproute2 package and is used to replace the older ifconfig command.

Overview

The ip command is used to configure and manage network interfaces and routing tables on Linux systems. It can be used to perform a variety of tasks, including:

  • Configuring network interfaces
  • Displaying network interface information
  • Configuring routing tables
  • Displaying routing table information
  • Configuring network addresses and routes
  • Displaying network address and route information
  • Configuring network tunnels
  • Displaying network tunnel information

Examples

Displaying Network Interface Information

To display information about all network interfaces on your system, you can use the following command:

ip address show

This will display information about all network interfaces, including their IP addresses, netmasks, and more.

Configuring Network Interfaces

To configure a network interface, you can use the following command:

ip address add <ip_address>/<netmask> dev <interface>

For example, to configure the eth0 interface with the IP address 192.168.0.2 and the netmask 255.255.255.0, you can use the following command:

ip address add 192.168.0.2/24 dev eth0

Specific Use Cases

The ip command can be used in a variety of situations, including:

  • Configuring a network interface with a static IP address
  • Configuring a network interface with a dynamic IP address using DHCP
  • Configuring a network interface to use a specific DNS server
  • Configuring a network interface to use a specific gateway

Options

The ip command has many options that can be used to perform various tasks. The following table lists some of the most commonly used options:

Option Description
address Configure IP addresses and related information
route Configure routing tables
link Configure network interfaces
tunnel Configure network tunnels
neighbour Manage ARP or NDISC cache entries
maddress Manage multicast addresses
monitor Monitor network traffic

Troubleshooting Tips

If you encounter issues when using the ip command, try the following troubleshooting tips:

  • Make sure you have the iproute2 package installed on your system
  • Check your command syntax for errors
  • Check your network configuration files for errors
  • Check your network hardware for issues

Notes

  • The ip command is a powerful tool that should be used with caution, as it can potentially cause network connectivity issues if used incorrectly.
  • The ip command replaces the older ifconfig command and should be used instead for configuring network interfaces on modern Linux systems.

Related commands