linux上网设置经典二法
1、一种是linux共享局域网内的windows主机上网
如果你的网卡linux能够识别的话在安装的时候会有网卡配置过程。从列表中选择网络设备，一般为eth0,点击“编辑”，在打开的“编辑接口”对话框中，用户可以通过DHCP来配置网络，这样也可以，不过我更喜欢定制一个静态IP，所以去掉“使用DHCP进行配置”前面的选项，然后在下面输入你要定制的IP地址和子网掩码，确定后，在下面的网关和主要DNS里输入当前局域网上做为主机的计算机的IP地址。这样装完以后就搞定。
如果你是装完后再安装的网卡的话，那可以在“系统设置”里选择“网络”，如果你的网卡安装成功的话会在下面的列表里看到你的网卡，同样设置DNS（和上面一样），然后再回到列表里，选中你的网卡，点上面的编辑，选中“当计算机启动时激活设备”，然后选择下面的“静态设置的IP地址”，在下面输入和上面同样的设置。再重新启动就可以了。
2、另外一种就是用你的linux通过ADSL上网了
在linux下就集成着一个ADSL拨号软件，打开终端，在里面输入#adsl-setup,然后进行设置：
LOGIN NAME
Enter your Login Name (default root):（输入你的用户名）
INTERFACE
Enter the Ethernet interface connected to the ADSL modem
For Solaris, this is likely to be something like /dev/hme0.
For Linux, it will be ethX, where 'X' is a number.
(default eth0):（选择网络设备）
Do you want the link to come up on demand, or stay up continuously?
If you want it to come up on demand, enter the idle time in seconds
after which the link should be dropped. If you want the link to
stay up permanently, enter 'no' (two letters, lower-case.)
NOTE: Demand-activated links do not interact well with dynamic IP
addresses. You may have some problems with demand-activated links.
Enter the demand value (default no):（选择是按需拨号，还是持续连接）
DNS
Please enter the IP address of your ISP's primary DNS server.
If your ISP claims that 'the server will provide dynamic DNS addresses',
enter 'server' (all lower-case) here.
If you just press enter, I will assume you know what you are
doing and not modify your DNS setup.
Enter the DNS information here:（选择DNS）
PASSWORD
Please enter your Password:
Please re-enter your Password:
USERCTRL
Please enter 'yes' (two letters, lower-case.) if you want to allow
normal user to start or stop DSL connection (default yes):（是否允许普通用户启动、关闭）
The firewall choices are:
0 - NONE: This script will not set any firewall rules. You are responsible
for ensuring the security of your machine. You are STRONGLY
recommended to use some kind of firewall rules.
1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation
2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway
for a LAN
Choose a type of firewall (0-2):（选择firewall的规则）
Start this connection at boot time
Do you want to start this connection at boot time?
Please enter no or yes (default no):（选择是否随机启动）
** Summary of what you entered **
Ethernet Interface:
User name:
Activate-on-demand:
DNS addresses:
Firewalling:
User Control:
Accept these settings and adjust configuration files (y/n)?（确认一下是否接受设置）
以上的设置在“系统设置”里 的“网络”里选择新建，建立一个xDSL连接，也可以实现。设置完成了以后在网络里激活连接。
