Linux Network Command detailed

1 ifconfig command

Format: ifconfig {inerface} {options}

The options parameters are: Up,down,mtu,netmask,broadcast

Separate ifconfig command: View all ports on the network;

Example 1:ifconfig eth0 192.168.1.0 netmask 255.255.0.0 MTU 8000 (IP address of configuration port eth0)

Example 2:ifconfig eth0:0 192.168.50.50 (indicates that a network interface is emulated in eth0)

Note: The ifconfig configuration will only take effect temporarily, the machine restarts or/etc/init.d/network restart, it will invalidate the ifconfig configuration;

2 ifup ifdown Command

Format: IFUP interface; Ifdown interface

Example: Ifup eth0;ifdown eth0

In fact, these two commands are scripts, they are to read the/etc/sysconfig/network-scripts/ifcfg-eth* file;

3 Route Command

Format: route or route-n See routing information

Route add [-host or-net] netmask GW or dev

Route del [-host or-net] netmask GW or dev

Example: Route add-net 192.168.100.0 netmask 255.255.255.0 Dev eth0

Example: Route add default GW 192.168.1.250

Note: ifconfig eth0 192.168.1.0 or route add-net 192.168.1.0 mask 255.255.255.0 Dev eth0 are temporarily active for networking and testing, and when the test is complete, use/E Tc/init.d/network Restart restore the original default network can be;

4 more powerful IP commands

(IP link setting)

Format: IP link set [device] [action and parameters]

Example: IP link Show (simply look at the device's related hardware information)

Example: IP link show eth0

Example: IP link set eth0 up; IP link set eth0 down; IP link set eth0 MTU 1000 (open and close ports and device MTU)

Example: IP link set eth0 down> IP link set eth0 name Vbird >IP link Show (change the name of the eth0 before changing the NIC Eth0)

(IP address)

Format: IP address [add|del] [IP] [dev] [related parameters]

Example: IP address Show (eth*)

Example: IP address add 192.168.50.50/24 broadcast dev eth0 label Eth0:vbird (add a network interface)

Example: IP address del 192.168.50.50/24 dev eth0

(IP route)

Example: IP route Show

Example: IP route add 192.168.5.0/24 dev eth0 (add route, mainly native direct communication network)

Example: IP route add 192.168.10.0/24 via 192.168.5.100 Dev eth0 (add route to external, via router)

Example: IP route add default via 192.168.1.254 dev eth0 (add route, by 192.168.1.254 this host communication, actually this host is my default router (gateway))

Example: IP route del 192.168.5.0/24;ip route del 192.168.10.0/24 (delete route)

Wireless network command: Iwlist (wireless card for wireless network AP detection and acquisition of relevant data) Iwconfig (wireless card configuration)

DHCP client command: dhclient: dhclient eth0

Linux Network Command detailed