[Linux] -- Failure to access the Internet when Ubuntu server 12.04 is restarted

From: http://blog.csdn.net/njchenyi/article/details/8715417

1. Configure static IP addresses:

# Vim/etc/Network/interfaces

The original content contains the following four lines:


auto lo

iface lo inet loopback

auto eth0

iface eth0 inet dhcp


The above indicates that IP addresses are allocated using DHCP by default, and are changed to the following:



auto lo

iface lo inet loopback

# The primary network interface

Auto eth0

# Iface eth0 Inet DHCP

iface eth0 inet static

address 192.168.80.129

netmask 255.255.255.0

gateway 192.168.80.2


Save and exit.
Note: you only need to set the address (IP address), netmask (subnet mask), and gateway (GATEWAY). The network and broadcast parameters can be left empty.

2. manually set the DNS server:

# Vim/etc/resolv. conf

Add the following content (all Linux distributions are generic ):

Nameserver 192.168.80.2

Nameserver 8.8.8.8

Save and exit.

Note: After you restart Ubuntu, you will find that you cannot access the Internet again. The problem lies in/etc/resolv. conf. After the file is restarted, the DNS configured in this file is automatically changed to the default value. Therefore, you need to modify DNS permanently. The method is as follows:

# Vim/etc/resolvconf/resolv. conf. d/base

Nameserver 192.168.80.2

Nameserver 8.8.8.8

3. Restart the networking service to make it take effect:

#/Etc/init. d/networking restart

In this way, the network configuration takes effect permanently.