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一、操作环境：
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机器系统与配置：三台机器的关健部件
第一台：台式机，双网卡，8139和8029，操作系统RedHat 8.0
5 n! _) E' R% {: ^+ V2 B. f& b第二台：Toshiba notebook，PC卡。RTL-8139/8139C/8139C+，操作系统RedHat 8.0
; j! d$ M' ~/ l! B. k第三台：台式机,8029网卡，操作系统windowme
Hub[集线器]：Tp-Link 10M，8口
ADSL，乙太口，非路由。

+ M: B0 m/ O) j) Z! C2 C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。
2 R5 l& S, w# X6 Z( p第一块网卡的ip设置：
ip地址:192.168.0.1
! \- d/ r3 e( N! T掩码:255.255.255.0
! v# B8 K7 g, g0 n2 P第二块网卡的设置
: W" {& f8 F8 L& s) G5 Z7 ~1 mip地址:192.168.0.2
' \) X+ h2 p$ W掩码：255.255.255.0
8 U5 i# _) |; N' b( |7 X在这两块网卡中，不要设置网关。
++++++++++++++++++++++++++++++++++++++++
2 L! |: q3 A+ Y+ w- y, v第二台：Toshiba notebook的网卡设置
IP：192.168.0.6
掩码：255.255.255.0
# }3 |, o) n, B7 a& n2 |2 S# W  X" [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
/ H7 I1 G7 \. J& F8 ~+ s5 V++++++++++++++++++++++++++++++++++++++++
7 `. j9 J* i! k: y5 Y: l第三台机器的网卡设置
7 K" c6 ^$ ^! fP：192.168.0.8
掩码：255.255.255.0
网关：192.168.0.1
DNS:设置电信给的，或者下面的也行
7 Y# G% J7 o0 @202.96.134.133
3 v2 J% V; d& E2 L* |) `$ ^2 m, ]6 U202.96.168.68
7 b0 k" }, s6 ^) j: ^! m7 L$ g! G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。
0 {; y% @% g8 E4 }4 N9 H#redhat-config-network

2]在终端上以root权限运行
( W, e* g8 O! G* d& d* z- |#adsl-setup
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[root@LinuxSir02 root]# adsl-setup
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8 b, C% Q3 h) b  P5 J& QWelcome to the ADSL client setup. First, I will run some checks on
your system to make sure the PPPoE client is installed properly...

8 f9 N9 B4 ?) s  [) T# t2 {
LOGIN NAME
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Enter your Login Name (default root): ADSL提供商给的用户名，写在这里

INTERFACE

3 R  r) R" H# ZEnter the Ethernet interface connected to the ADSL modem
For Solaris, this is likely to be something like /dev/hme0.
: O+ X; ?- T2 J3 Y+ d0 U1 h, UFor Linux, it will be ethX, where 'X' is a number.
(default eth0): eth0这是ADSL通过第一台机器的第一张网卡eth0提供上网
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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
4 S& O: g8 x  z+ F( dafter which the link should be dropped. If you want the link to
7 W8 Q& w6 M* a5 z) U4 Ostay 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):在这里按一下回车就行了。
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7 g' G% S7 J6 H# X2 ?: R& nDNS
9 a7 K7 M# m' W: f7 E
& N( }+ @! f9 u5 V8 dPlease enter the IP address of your ISP's primary DNS server.
9 p* D- c. _/ M6 @9 \# a5 nIf your ISP claims that 'the server will provide dynamic DNS addresses',
enter 'server' (all lower-case) here.
& I) N& X; h$ ~9 v/ m! |. t* q. bIf you just press enter, I will assume you know what you are
doing and not modify your DNS setup.
Enter the DNS information here: 202.96.134.133这是DSN，最好用你本地电信给的
) f8 o( V" [7 v2 a& hPlease enter the IP address of your ISP's secondary DNS server.
4 z6 v5 G' n- C- U) P* y7 L- m2 rIf you just press enter, I will assume there is only one DNS server.
0 Y# E/ ]0 p9 s' DEnter the secondary DNS server address here: 202.96.168.68这是第二个DNS，也是电信给的。

: j7 ^3 p9 P: A2 p  s' k9 |PASSWORD
4 T! e1 V0 u: i& P
- a. T/ d5 ^' T- J( BPlease enter your Password:在这里把ADSL提供商给的密码写上
Please re-enter your Password:
8 a! ?6 |0 Y% W
USERCTRL

& D, x9 Y# Z: O/ Y+ PPlease enter 'yes' (two letters, lower-case.) if you want to allow
, [2 E$ m5 z- Z" Mnormal user to start or stop DSL connection (default yes): yes
$ S! G5 j+ L+ [9 B
% E4 n* @: z& t' f, mFIREWALLING
  q! ?/ K& N' W) [2 C5 Z9 J
Please choose the firewall rules to use. Note that these rules are
+ q2 Q9 i( ]' w# Fvery basic. You are strongly encouraged to use a more sophisticated
5 X/ X9 y) ~3 D( [3 K2 ?firewall setup; however, these will provide basic security. If you
  a' m9 G5 [3 k" [2 g" v' F. gare running any servers on your machine, you must choose 'NONE' and
set up firewalling yourself. Otherwise, the firewall rules will deny
access to all standard servers like Web, e-mail, ftp, etc. If you
! d1 G8 r7 p: R( hare using SSH, the rules will block outgoing SSH connections which
allocate a privileged source port.

0 x* x8 p+ V4 E! A) u* aThe firewall choices are:
9 e5 T5 E: B( e- H0 - 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.
- p8 X  ^$ K" q4 C: c2 _/ A# m( ~1 m1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation
. q/ ^9 ^- ?6 c) D1 r( i5 S2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway
5 O4 q1 N  l7 A' }9 ffor a LAN
# A. y9 |7 e% c" p0 F6 |Choose a type of firewall (0-2): 2

$ H6 i4 W/ z" `Start 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
  X9 T- d2 ~9 k& UUser name: ADSL用户名
3 a! W0 ]8 B+ cActivate-on-demand: No
; S, k/ `0 @# o* _2 QPrimary DNS: 202.96.134.133
5 l$ A. I8 z2 d7 U# N5 I( JSecondary DNS: 202.96.168.68
+ O( X( x0 L4 h5 M( OFirewalling: MASQUERADE
User Control: yes
4 D$ g, U4 y# Q+ k  e# P4 I  jAccept these settings and adjust configuration files (y/n)?y
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三、在/etc/rc.d/rc.local中加入如下：
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echo 1 > /proc/sys/net/ipv4/ip_forward
3 `3 d2 Y8 c# `: ]iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE
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四、重新启动机器。就OK了。这有多简单