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一、操作环境：
  u) E  Y6 R. M% G" G( x
机器系统与配置：三台机器的关健部件
9 j& |2 O" C" `2 B7 U& {9 i- K6 {. D+ X第一台：台式机，双网卡，8139和8029，操作系统RedHat 8.0
第二台：Toshiba notebook，PC卡。RTL-8139/8139C/8139C+，操作系统RedHat 8.0
第三台：台式机,8029网卡，操作系统windowme
# r( p0 |, Y! NHub[集线器]：Tp-Link 10M，8口
3 g/ J7 V1 z% U; I2 ~ADSL，乙太口，非路由。

二、网卡设置如下：
在第一台机器的双网卡的接法：把ADSL接在eth0上，把eth1接在HUB上。
3 F1 q( x. ?- z4 Y. ?第一块网卡的ip设置：
ip地址:192.168.0.1
掩码:255.255.255.0
第二块网卡的设置
+ F; j3 B5 P  [$ Qip地址:192.168.0.2
6 T; f8 O% D" O+ `0 {掩码：255.255.255.0
在这两块网卡中，不要设置网关。
++++++++++++++++++++++++++++++++++++++++
$ w) c* ~) p; O$ v/ u* f第二台：Toshiba notebook的网卡设置
IP：192.168.0.6
/ c6 e% C; \- F掩码：255.255.255.0
2 y  I. z1 Z# M5 |0 q网关：192.168.0.1
DNS:设置电信给的，或者下面的也行
202.96.134.133
202.96.168.68
* U9 q) G1 W; P+ \- r++++++++++++++++++++++++++++++++++++++++
第三台机器的网卡设置
P：192.168.0.8
掩码：255.255.255.0
5 d$ R4 f, D! v: q' x网关：192.168.0.1
7 x  }) J5 @6 a. PDNS:设置电信给的，或者下面的也行
202.96.134.133
202.96.168.68
- B3 g% w/ ?# |( Z) W$ [三、设置ppp拔号，
1]删除原来的ppp的ADSL链接。
如果redhat-config-network原来已经用 redhat-config-network设置的ppp的ADSL连接拔号，用下面的命令调用删除。
. `9 Y5 M0 N+ ^) a, b# B#redhat-config-network

2]在终端上以root权限运行
#adsl-setup
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, E! j- ]& v! S, h" \[root@LinuxSir02 root]# adsl-setup

* }: G- h3 E3 S# OWelcome to the ADSL client setup. First, I will run some checks on
your system to make sure the PPPoE client is installed properly...

; w( F8 _8 B* y% @* n  i" M
2 u. T8 }' @  X3 s7 L- BLOGIN NAME

Enter your Login Name (default root): ADSL提供商给的用户名，写在这里

4 Q- V5 A+ o) I& \! Y+ mINTERFACE

Enter the Ethernet interface connected to the ADSL modem
! \( L' A. B; H7 ?9 O; u9 }For Solaris, this is likely to be something like /dev/hme0.
* P) n+ j5 Y( y9 T" q: _7 V' v4 AFor Linux, it will be ethX, where 'X' is a number.
$ f  B3 L: v$ d+ E4 b# b. t$ i(default eth0): eth0这是ADSL通过第一台机器的第一张网卡eth0提供上网
5 d* X1 o# Z9 i

Do you want the link to come up on demand, or stay up continuously?
3 v4 i4 J: u7 _2 O; c' Y: a+ {If you want it to come up on demand, enter the idle time in seconds
. K  C& [- d$ V5 R  z; Gafter which the link should be dropped. If you want the link to
stay up permanently, enter 'no' (two letters, lower-case.)
/ f4 ]/ L- U; Y* R7 q7 R% tNOTE: Demand-activated links do not interact well with dynamic IP
addresses. You may have some problems with demand-activated links.
3 D2 U( d6 j: i0 [, b5 B1 E. }Enter the demand value (default no):在这里按一下回车就行了。

DNS

4 |+ F" X/ L/ @3 m* W* f' R6 F% wPlease 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
/ h- _# d1 ]( O# Ydoing and not modify your DNS setup.
! ~; [& g* r" |; E8 M& S( P4 {: mEnter the DNS information here: 202.96.134.133这是DSN，最好用你本地电信给的
Please enter the IP address of your ISP's secondary DNS server.
If you just press enter, I will assume there is only one DNS server.
Enter the secondary DNS server address here: 202.96.168.68这是第二个DNS，也是电信给的。

PASSWORD

Please enter your Password:在这里把ADSL提供商给的密码写上
Please re-enter your Password:

% U4 s6 i5 z! b; uUSERCTRL

Please enter 'yes' (two letters, lower-case.) if you want to allow
# ^( Z$ a+ o! A6 p9 L& D* Ynormal user to start or stop DSL connection (default yes): yes

FIREWALLING

& n' }* B2 h' G' M0 X* APlease choose the firewall rules to use. Note that these rules are
very basic. You are strongly encouraged to use a more sophisticated
firewall setup; however, these will provide basic security. If you
are running any servers on your machine, you must choose 'NONE' and
set up firewalling yourself. Otherwise, the firewall rules will deny
3 f* u; L: p3 ]/ Vaccess to all standard servers like Web, e-mail, ftp, etc. If you
1 E# [8 z! q$ _' jare using SSH, the rules will block outgoing SSH connections which
allocate a privileged source port.
, \2 J4 R6 C$ I4 a0 v; ?- V
. c, h. s$ ?0 e- ~- MThe firewall choices are:
- Z9 C3 E( o' l$ x+ E4 P0 - NONE: This script will not set any firewall rules. You are responsible
2 K4 c6 F  u, I5 \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): 2

4 H4 C4 p: H9 l# E, e- R- a/ EStart this connection at boot time

Do you want to start this connection at boot time?
Please enter no or yes (default no):yes

** Summary of what you entered **

Ethernet Interface: eth0
User name: ADSL用户名
Activate-on-demand: No
" d  l: T% F( l% {Primary DNS: 202.96.134.133
( n' d$ m  `& t& ~Secondary DNS: 202.96.168.68
Firewalling: MASQUERADE
User Control: yes
Accept these settings and adjust configuration files (y/n)?y
" z+ j* P1 _" q4 d# g0 Y
7 J# j7 s' j  ?: q: v2 A9 v0 E
三、在/etc/rc.d/rc.local中加入如下：
, u4 F" c! v, B% {" I6 e  {
echo 1 > /proc/sys/net/ipv4/ip_forward
) S- f, A+ l% c) ^6 P0 liptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE

# Z7 E0 c$ F3 Q; Q四、重新启动机器。就OK了。这有多简单