ifconfig
configures network interfaces
TLDR
Show all interfaces
$ ifconfig
Show specific interface$ ifconfig [eth0]
Set IP address$ sudo ifconfig [eth0] [192.168.1.100]
Enable interface$ sudo ifconfig [eth0] up
Disable interface$ sudo ifconfig [eth0] down
Set netmask$ sudo ifconfig [eth0] netmask [255.255.255.0]
SYNOPSIS
ifconfig [interface] [options]
DESCRIPTION
ifconfig configures network interfaces. It displays and modifies IP addresses, netmasks, and interface status. Without arguments, it shows all active interfaces. With -a, it shows all interfaces including those that are down.The tool is part of net-tools and is being replaced by the ip command from iproute2, but remains widely used on many systems.
PARAMETERS
INTERFACE
Network interface name.up
Activate interface.down
Deactivate interface.netmask MASK
Set network mask.broadcast ADDR
Set broadcast address.mtu SIZE
Set MTU size.-a
Display all interfaces, even if down.hw class address
Set hardware (MAC) address (e.g. `hw ether AA:BB:...`).promisc / -promisc
Enable or disable promiscuous mode.arp / -arp
Enable or disable ARP protocol on the interface.multicast / -multicast
Enable or disable multicast flag.add ADDR/PREFIX
Add an IPv6 address to the interface.del ADDR/PREFIX
Remove an IPv6 address from the interface.--help
Display help information.
INSTALL
sudo apt install net-tools
sudo dnf install net-tools
sudo pacman -S net-tools
sudo apk add net-tools
sudo zypper install net-tools
brew install net-tools
nix profile install nixpkgs#net-tools
CAVEATS
Deprecated for ip command. Part of net-tools. Root needed for changes.
HISTORY
ifconfig has been part of Unix networking since 4.2BSD (1983). On Linux it is part of the net-tools package, now largely superseded by iproute2.
