Linux set up IP, you can access the intranet, no access to the external network

1, set the network card, IP

Device=eth0 #描述网卡对应的设备别名, for example, in Ifcfg-eth0 file it is eth0   bootproto=static #设置网卡获得ip地址的方式, the possible options are static,dhcp or BOOTP, Corresponding to statically specified IP addresses, IP addresses obtained through the DHCP protocol, IP addresses obtained through the BOOTP protocol   broadcast=192.168.0.255 #对应的子网广播地址   Hwaddr=00:07:e9:05:e8 : B4 #对应的网卡物理地址   ipaddr=192.168.0.2 #如果设置网卡获得 IP address is specified statically, this field specifies the IP address of the NIC   ipv6init=no   ipv6_autoconf= No   netmask=255.255.255.0 #网卡对应的网络掩码   network=192.168.0.0 #网卡对应的网络地址   onboot=yes #系统启动时是否设置此网络接口, when set to Yes , this device is activated at system startup

Restart the NIC

Service Network restart  

Test network:

Ping www.baidu.com

Many times use Baidu to test network connectivity, ^_^

If you can ping the pass, then it is OK. If the ping does not pass

[Email protected] ~]# Ping Www.baidu.comping:unknown host www.baidu.com

Set up Gateway Routing

Route add default  GW  Gateway IP

It feels like the default gateway must be localhost. After the first setup, it is the IP

[Email protected] ~]# netstat-rkernel IP Routing tabledestination Gateway genmask Flags MSS Window irtt Iface172.16.0.0*255.255.255.0U0 0          0Eth0link-local *255.255.0.0U0 0          0eth0default         172.16.0.1      0.0.0.0Ug0 0          0Eth0[[email protected]~]# Ping Www.baidu.comping:unknown host www.baidu.com

Then set up the/etc/resolv.conf file

Set nameserver

202.106. 0.20  202.106. 196.115

Restart the NIC

Check Again

[Email protected] ~]# netstat-rkernel IP Routing tabledestination Gateway genmask Flags MSS Window irtt Iface172.16.0.0*255.255.255.0U0 0          0Eth0link-local *255.255.0.0U0 0          0eth0defaultlocalhost0.0.0.0Ug0 0          0Eth0

Happy to connect to the Sisu network.

[[Email protected] ~]# Ping Www.baidu.comPING www.a.shifen.com (61.135.169.125) About( -) bytes of data. -bytes from 61.135.169.125: icmp_seq=1Ttl= AboutTime=1.40Ms -bytes from 61.135.169.125: icmp_seq=2Ttl= AboutTime=1.57Ms

The principle is not very clear. Mark a moment first.

Linux set up IP, you can access the intranet, no access to the external network