Linux ifconfig Commands

First, Introduction

Ifconfig is a tool that Linux systems use to obtain and modify network interface configuration information.

Note: The NIC information configured with the Ifconfig command does not exist after the machine restarts after the network card restarts. In order to keep the above configuration information in the computer forever, it is necessary to modify the network card configuration file.

Second, the application example:

Example 1: Displaying network device information (active state)

Ifconfig

Example 2: Start and close the specified NIC

ifconfig eth0      up ifconfig eth0 down   #关闭网卡eth0

Example 3: Configuring and removing IPV6 addresses for network cards

ifconfig eth0 add 33ffe:3240:1005::2/   #为网卡eth0配置IPv6地址  ifconfig eth0 del 33ffe:3240:+:1005::2/   # Remove IPV6 address for Nic Eth0

Example 4: Modifying MAC Addresses

ifconfig xx: AA:BB:CC:DD:EE

Example 5: Configuring IP Addresses

ifconfig 192.168. 120.56 ifconfig 192.168. 120.56 255.255. 255.0  

ifconfig 192.168. 120.56 255.255. 255.0 192.168. 120.255

Example 6: Enabling and shutting down the ARP protocol

ifconfig ARP protocol for eth0 ARP    #开启网卡eth0;ifconfig eth0-arp   #关闭网卡eth0 ARP protocol;

Example 7: Setting the Maximum transmission unit

ifconfig  the

Example 8: Turn on the eth0 Nic's blending mode

ifconfig  Eth0  Promisc

Linux ifconfig Commands