Linux Network Configuration Command ifconfig, route, IP, IP route

Ifconfig

Route

Ip

IP route

One, ifconfig command (view or configure IP)

1. View Network Connections

# ifconfig \ Show all active connections, not packet-disabled devices

Or

# IFCONFIG-A \ Show all active and inactive connections

Displays the connection for the specified interface

# ifconfig Eth1

2. Configure IP Address

# ifconfig eth1 192.168.0.1 netmask 255.255.255.

Or

# ifconfig eth1 192.168.0.1/24

3. Enable or disable the interface

# ifconfig eth1 down|up or # Ifdown eth1 \ Disable interface # IFUP eht1 \ Enable interface

Second, Route command (view or configure routing)

1, view the route, use-n can view the display route in the number format to avoid the reverse of the host name, resulting in a slow query.

# route-ndestination Gateway genmask Flags Metric Ref use Iface192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1

Target Next hop address mask flag bit hop point ref which interface is used

2. Add route

(a), network routing

# route add-net 192.168.1.0/24 GW 172.16.1.106

(b), host routing

# route Add-host 192.168.1.110 GW 172.16.1.106

(c), default route

# route Add default GW 172.16.1.106 or # route add-net 0.0.0.0 GW 172.16.1.106

Check out these three newly created

destination     gateway          genmask         flags metric  Ref    Use Iface192.168.1.110   172.16.1.106     255.255.255.255 UGH   0      0         0 eth0192.168.1.0     172.16.1.106     255.255.255.0   UG    0      0         0 eth00.0.0.0          172.16.1.106    0.0.0.0         ug     0      0         0 eth0 

3. Delete a route

# route Del-host 192.168.1.110# Route del-net 192.168.1.0/24

Third, DNS configuration

The content can only be modified by configuration file:/etc/resolv.conf

; Generated by/sbin/dhclient-scriptsearch localdomain feng.com \ Search domain nameserver 172.16.0.2 \ DNS domain name server

One line of DNS, up to three DNS

************************************************************************************

With the development of the system above two kinds of commands, will slowly be replaced by the following two commands.

Ifconfig = IP

Route = IP route

IP command

1. IP link (view network connection or enable disable NIC)

(a), view network Connections

# IP link show [interace] \ \ Interface can be saved, omit to show all connections

(b), enable disable interface and turn off enable multicast

IP link Set Interface [up|down] [multicast On|off]

2. IP addr (IP address management)

Configure IP

Format: IP addr Add dev Interface Address [Label Interface_alias]

(a), configure an IP or multiple IP for eth1

# IP addr Add dev eth1 192.168.1.118/24

(b), eth1 alias eth1:0 Configure an IP

# IP addr Add dev eth1 192.168.0.12/24 label eth1:0

View the configured IP

# IP addr show eth1 \ \ View the configured IP, the IP configured by this command cannot use Ifconfig to view 3:eth1: <BROADCAST,MULTICAST> MTU Qdisc pfifo_fast STA  Te down Qlen link/ether 00:0c:29:42:91:29 brd ff:ff:ff:ff:ff:ff inet 192.168.1.118/24 scope Global eth1 inet 192.168.0.12/24 Scope Global eth1:0

Remove the configured IP

# ip addr del dev eth1 192.168.1.118/24

Clear Configuration

# IP Addr Flush Interface [to net_address]

# IP addr flush eth1 \ \ \ \ \ \ \ \ \ \ \ All IP configuration of the NIC can be cleared

Or

IP addr flush eth0 to 192.168.0.0/24 \ \ As long as the IP of the same network segment and 192.168.0 will be cleared out

Or

IP addr flush eth0 192.168.16.19/24 \ \ Only clears the specified IP

3. IP Route Routing Configuration

IP route

(a), view routing configuration

# IP route Show or IP route

(b), configure routing

IP route add DESTINATION [via Next_hop] [src source_address] [Dev DEVICE] #

# IP route add 192.168.1.0/24 via 172.16.1.106

If the NIC is configured with more than one IP, you can specify which network card the packet is from.

# IP route add 192.168.1.0/24 src 172.16.1.106 dev eth1

# ip route show192.168.1.0/24 dev eth1 scope link src 172.16.1.106

(c), delete route

# IP Route del 192.168.0.1/24

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Linux Network Configuration Command ifconfig, route, IP, IP route