Key Points of ubuntu 12.04 lts Network Configuration

There are two ways to configure the network. These two methods conflict with each other. We recommend that you use network-manager for the desktop system. The server version is configured through the file/etc/Network/interfaces.

Network-Manager configuration method:

1. Make sure that the/etc/Network/interfaces file contains only the content of the local loop, for example

   • Auto loiface lo Inet loopback

2. Make sure that network-manager is enabled. Open the configuration file/etc/NetworkManager. conf. The content of the configuration file is:

   • [Main] plugins = ifupdown, keyfiledns = dnsmasq [ifupdown] managed = true # True indicates that the agent is enabled, and false indicates that the agent is not enabled.

3. After completing the last two steps, restart and press the shortcut key Alt + F2. Enter the command network connection to open the network connection Configuration window and configure the network as needed.

/Etc/Network/interfaces ):

2. open the file/etc/Network/interfaces, make sure the network manager is not enabled (see the preceding figure), and configure the following content:

   •  # The loopback network interface (configure the loopback interface) auto lo # activate the lo interface iface lo Inet loopback # configure the lo interface as the loopback interface # the primary network interface (configure the main network interface) auto eth0 # enable the eth0 interface iface eth0 Inet static # configure the eth0 interface as the static IP Address 10.16.3.99 netmask 255.255.255.0 network 10.16.3.0 broadcast 10.16.3.255 gateway 10.16.3.1 

4. Configure the DNS server, open the file/etc/resolv. conf, and set the content:

   • Nameserver 127.0.0.1

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