Configure IP, DNS, and route under Linux

Linux Static IP Settings

IP configuration:

Vim/etc/sysconfig/network-scripts/ifcfg-eth0

Device=eth0

Bootproto=static

Hwaddr=00:26:18:0b:38:c0

Onboot=yes

ipaddr=192.168.0.2

netmask=255.255.255.0

gateway=192.168.0.1

IP takes effect:

/sbin/ifdown eth0

/sbin/ifup eth0

Notification Gateway Update information:

/etc/init.d/network restart

To configure DNS:

Vi/etc/resolv.conf

NameServer 202.96.134.133

Resolve reboot Effective:

Chattr +i/etc/resolv.conf

Change to read-only

First, understand the traditional network configuration commands:

1. Configure and view network interface conditions using the Ifconfig command

Example 1: Configure eth0 IP and activate the device at the same time:

# ifconfig eth0 192.168.4.1 netmask 255.255.255.0 up

Example 2: Configure IP for the eth0 alias device eth0:1 and add routes

# ifconfig Eth0:1 192.168.4.2

# route add–host 192.168.4.2 Dev eth0:1

Example 3: Activating (disabling) a device

# ifconfig eth0:1 up (down)

Example 4: View all (specified) network interface configurations

# ifconfig (eth0)

2. Configure the routing table with the route command

Example 1: Adding to host routing

# route add–host 192.168.4.2 Dev eth0:1

# route Add–host 192.168.4.1 GW 192.168.4.250

Example 2: Routes added to the network

# route add–net IP netmask MASK eth0

# route add–net IP netmask MASK GW IP

# route Add–net ip/24 eth1

Example 3: Adding a default gateway

# route add default GW IP

Example 4: Removing routes

# route del–host 192.168.4.1 Dev eth0:1

Example 5: View routing information

# route or Route-n (-n indicates that the name is not resolved, the list speed is faster than route)