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<p><FONT class=normalfont><B><font color=blue>Redhat9＋ADSL＋IPTABLES＋DHCPD解决方案</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：张微波<br>来自：Linux知识宝库<br>联系方式：无名<br><br>本解决方案要用到服务有 ppp0 , dhcp ,iptables ,squid (其中dhcp和squid可选择不装)<br>
<br>
最终实现目标: 服务器redhat用adsl拨号上网,下面局域网的其他机器通过服务器的iptables服务上网,并且基本上网服务都不受影响。如果你的客户端比较多的话，可以选择安装squid服务，使客户端访问网页速度快一点。当然如果你觉的你懒的去配置客户端的TCP/IP设置，那你可以启动DHCP服务。<br>
<br>
<br>
服务器: redhat9.0 3com905b X 2 中兴的ZXDSL831 北京网通ADSL线路（非包月）<br>
IP地址分配:<br>
redhat服务器:<br>
eth0: 192.168.0.1 255.255.255.0 其他网关,dns等都不要配置(如图),<br>
此网卡用于连接局域网其他机器<br>
<br>
eht1: 192.168.1.2 255.255.255.0其他网关,dns等都不要配置(如图),<br>
此网卡用于ADSL拨号用,注意大家千万不要设置成192.168.1.1,因为我的中兴的ADSL有个默认的配置地址就是192.168.1.1<br>
<br>
以上我们服务器的两块网卡都是静态设置，而不是大家常说的ADSL网卡要设置成DHCP获取地址。<br>
<br>
客户端的IP地址设置我们这里选择DHCP获取。如果你要静态设置，那你可以设置成<br>
192.168.0.2－192.168.0.254之间的ip地址，子网掩码都是255.255.255.0，网关都指向192.168.0.1，DNS指向192.168.0.1或者其他你知道的ISP的DNS地址<br>
<br>
<br>
好服务器的网卡基本配置完成，现在我们来配置adsl连接，网上有很多人说redhat的自ADSL有问题，可我配置却没有任何问题。我是直接用命令adsl-setup来配置<br>
<br>
输入：adsl-setup 进入配置对话<br>
<br>
Welcome to the ADSL client setup. First, I will run some checks on<br>
your system to make sure the PPPoE client is installed properly...<br>
<br>
The following DSL config was found on your system:<br>
<br>
Device: Name:<br>
ppp0 DSLppp0<br>
<br>
Please enter the device if you want to configure the present DSL config<br>
(default ppp0) or enter 'n' if you want to create a new one: 建立的拨号连接名字,默认就行<br>
<br>
LOGIN NAME<br>
<br>
Enter your Login Name (default ): 输入ADSL账号的登陆用户名<br>
<br>
INTERFACE<br>
<br>
Enter the Ethernet interface connected to the ADSL modem<br>
For Solaris, this is likely to be something like /dev/hme0.<br>
For Linux, it will be ethX, where 'X' is a number.<br>
(default eth1): ADSL设备所绑定的网卡,我们这里是eht1<br>
<br>
Do you want the link to come up on demand, or stay up continuously?<br>
If you want it to come up on demand, enter the idle time in seconds<br>
after which the link should be dropped. If you want the link to<br>
stay up permanently, enter 'no' (two letters, lower-case.)<br>
NOTE: Demand-activated links do not interact well with dynamic IP<br>
addresses. You may have some problems with demand-activated links.<br>
Enter the demand value (default no): 默认就行<br>
<br>
DNS<br>
<br>
Please enter the IP address of your ISP's primary DNS server.<br>
If your ISP claims that 'the server will provide dynamic DNS addresses',<br>
enter 'server' (all lower-case) here. 注意这里我们不要填写任何DNS地址,后面我们会配置ADSL自动从ISP中获取dns地址<br>
If you just press enter, I will assume you know what you are<br>
doing and not modify your DNS setup.<br>
Enter the DNS information here:<br>
<br>
PASSWORD<br>
<br>
Please enter your Password: 输入ADSL账号的密码<br>
Please re-enter your Password: 密码验证<br>
<br>
USERCTRL<br>
<br>
Please enter 'yes' (two letters, lower-case.) if you want to allow<br>
normal user to start or stop DSL connection (default yes): 默认就行<br>
<br>
<br>
FIREWALLING<br>
<br>
Please choose the firewall rules to use. Note that these rules are<br>
very basic. You are strongly encouraged to use a more sophisticated<br>
firewall setup; however, these will provide basic security. If you<br>
are running any servers on your machine, you must choose 'NONE' and<br>
set up firewalling yourself. Otherwise, the firewall rules will deny<br>
access to all standard servers like Web, e-mail, ftp, etc. If you<br>
are using SSH, the rules will block outgoing SSH connections which<br>
allocate a privileged source port.<br>
<br>