How network settings are configured in Linux

After installing the Linux system, log in and modify the file:

The code is as follows

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# cat/etc/sysconfig/network-scripts/ifcfg-eth0 device= "Eth0″ bootproto=" None " hwaddr=" 00:50:56:be : 7a:d8″ ipaddr=192.168.2.108                            #IP地址, you must set the gateway= 192.168.2.21                          #网关地址, this is very important, if you do not set this on the smart is the LAN can not be connected with the external network of the onboot= "yes"                                              #开机启动设置为yes uuid= "Fe45f058-9ce7-42a4-823c-abe472aad9f2″ Ipv6init=no netmask= 255.255.255.0                 # Subnet mask

After setting up, edit the domain name server settings file

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# cat/etc/resolv.conf NameServer 192.168.2.01 #域名服务器的地址, if you do not set this, you cannot access the site as a domain name Search hostname #这个相当于你本机的域名

Reboot the network service after setting

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#/etc/init.d/network Restart

By doing the following Ifconfig command, you can see that your computer is already networked, and you can use the ping command to test whether it is networked.

Friendly tips:

Directly modify/etc/resolv.conf This file is useless, network service restart will be based on/etc/sysconfig/network-scripts/ifcfg-eth0 to overload the configuration, if Ifcfg-eth0 does not configure DNS, Then the resolv.conf will be flushed out and become null again.

What do we do? Here are two ways to fix this:

1, through the Ifcfg-eth0 can also set the DNS server address, and automatically modify or generate resolv.conf files.

2, in the Ifcfg-eth0 can be Peerdns parameters to determine whether to modify the resolv.conf file, set Peerdns=yes (which is also the system's default configuration) when the network device is enabled, the resolv.conf file will be modified or generated, Set Peerdns=no, do not make any changes to resolv.conf.

Supplemental Parts:

When a domain name resolution is required (for example, Ping www.111cn.net), the resolv.conf file is read first to obtain the DNS server address, and then the DNS server is sent a domain resolution request. If the resolv.conf is set incorrectly or no resolv.conf will cause domain name resolution to fail.

If the IFCFG-ETH0 is configured as DHCP mode, the system defaults to Peerdns=no, that is, the DNS address that will be obtained with DHCP to modify or generate resolv.conf files.

I think there is no special situation, do not set DNS in the resolv.conf, you should set the DNS server address in Ifcfg-eth0 convenient, that is, in line with normal thinking is easier to maintain and manage.

Note: the way to set up the network is limited to the Linux system such as Fedora,redhat,centos, and other systems may be somewhat different.