Basic methods of modifying IP address, gateway and DNS under Linux system

Temporarily modify IP address, gateway, host name, DNS, immediately effective, no reboot (failure after reboot)

1. Modify Host Name

The code is as follows:

#hostname Slyar

2. Modify IP address (eth0 is the name of the network card)

The code is as follows:

#ifconfig eth0 192.168.1.5 netmask 255.255.255.0

3. Modify the default gateway (Eth0 is the name of the network card)

The code is as follows:

#route add default GW 192.168.1.1 Dev eth0

4. Modify DNS

The code is as follows:

#vim/etc/resolv.conf

CentOS (RedHat) command line permanently modifies IP address, gateway, DNS

The command line permanently modifies IP addresses, gateways, and DNS

1. Modify IP Address

First check the number and name of your host network card, the relevant information under the/etc/sysconfig/network-scripts/.

I can see from the figure that I have 2 network cards, the first is Ethernet physical network card, number 0, if you have more than one network card, then numbered 0, 1, 2, 3 ...; The second network card is a loopback network card, generally do not need to set.

Use VIM edit you need to set IP network card, here I can only modify Ifcfg-eth0, look at the map, not many explanations, the previous state is Bootproto set to DHCP when the writing.

The code is as follows:

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

The code is as follows:

Device=eth0 #网卡名称

Bootproto=static #获取ip的方式 (STATIC/DHCP/BOOTP), not explained

hwaddr=00:0c:29:b5:b2:69 #MAC地址

ipaddr=12.168.1.5 #IP地址

netmask=255.255.255.0 #子网掩码

network=192.168.1.0 #网络地址

broadcast=192.168.0.255 #广播地址

Nboot=yes #启动设备

2. Modify Gateway

The code is as follows:

Vim/etc/sysconfig/network

Add a gateway Message

The code is as follows:

gateway=192.168.1.1

3. Modify DNS

The code is as follows:

Vim/etc/resolv.conf

Adding DNS information can

The code is as follows:

NameServer 192.168.1.1

4. Reload Network Configuration

The code is as follows:

/etc/init.d/network restart