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一、操作环境：
- }1 i3 {+ X" i9 n
* w# a) Y4 L) N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
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
Hub[集线器]：Tp-Link 10M，8口
ADSL，乙太口，非路由。

二、网卡设置如下：
7 N) e" P' E% l) l9 ?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。
$ i2 ^- B, a1 o3 _9 a第一块网卡的ip设置：
) _2 \: u2 M. i5 y3 c& e$ P% g0 Qip地址:192.168.0.1
+ _! _4 ?: ~7 Q, }- }掩码:255.255.255.0
第二块网卡的设置
ip地址:192.168.0.2
& Z+ W# [6 r! q- Q掩码：255.255.255.0
0 ?7 O) M# s6 [' g在这两块网卡中，不要设置网关。
. [& s% Y% L8 L! w: O7 p++++++++++++++++++++++++++++++++++++++++
2 N( i6 c7 ^+ Y3 V& D9 ?% C4 p第二台：Toshiba notebook的网卡设置
/ l. e, W, o) E# dIP：192.168.0.6
, P5 M/ Y  e6 C9 N: d掩码：255.255.255.0
网关：192.168.0.1
/ F3 i! I8 o* b' ?% m" V- bDNS:设置电信给的，或者下面的也行
202.96.134.133
% \1 G1 {, H' B2 u8 k" Q6 ?202.96.168.68
++++++++++++++++++++++++++++++++++++++++
第三台机器的网卡设置
1 ^2 x4 O/ Q% V, p) [P：192.168.0.8
掩码：255.255.255.0
+ }& |$ I9 v7 |/ k网关：192.168.0.1
  t$ ]. A8 w, N0 Z0 zDNS:设置电信给的，或者下面的也行
202.96.134.133
202.96.168.68
# g/ z: e6 ~4 ^! E* a# f; j三、设置ppp拔号，
1]删除原来的ppp的ADSL链接。
  f( B0 ]! I! F9 A% f* j# T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。
#redhat-config-network

2]在终端上以root权限运行
#adsl-setup

! l7 S  I0 a: P9 Z" o  |
+ c  @8 I7 k$ Y2 L/ E[root@LinuxSir02 root]# adsl-setup

- a) Z2 J7 c5 y: g0 q* nWelcome to the ADSL client setup. First, I will run some checks on
your system to make sure the PPPoE client is installed properly...


LOGIN NAME
$ m9 G8 q: ~3 {# ]9 H: @6 B
Enter your Login Name (default root): ADSL提供商给的用户名，写在这里

INTERFACE
, D) D! @, L: S3 a/ F
. l$ p. O  p9 c+ ^. e7 K# AEnter the Ethernet interface connected to the ADSL modem
3 X& R3 S/ j5 M. wFor Solaris, this is likely to be something like /dev/hme0.
For 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
6 }. u- H' h, H2 C5 x! J
: ^+ k0 v5 H. n! q+ x
7 o6 r) q( R0 I' zDo 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
6 E$ X& r5 h- y9 ?2 Wafter 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):在这里按一下回车就行了。

8 F2 K9 u/ L0 e6 S3 G7 c$ s: ]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
3 p! c0 B+ ]+ K: @. P7 ^doing and not modify your DNS setup.
# n: R( T5 I) s/ 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。

: d7 R" y" \( r" V6 n6 APASSWORD
4 I7 m9 P  L" _$ D* V+ d5 w
Please enter your Password:在这里把ADSL提供商给的密码写上
& f$ s6 I# }2 X% z: X5 E) UPlease 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): yes
5 E. T/ ^5 p# n
FIREWALLING

Please choose the firewall rules to use. Note that these rules are
- l$ t9 j2 W6 V9 {very basic. You are strongly encouraged to use a more sophisticated
7 d& g- ?. {, `0 k% q1 Ofirewall setup; however, these will provide basic security. If you
8 K) \! i. b/ f5 u9 n2 {$ sare running any servers on your machine, you must choose 'NONE' and
3 D& f5 o7 o+ d) Y: o. R/ Sset up firewalling yourself. Otherwise, the firewall rules will deny
access to all standard servers like Web, e-mail, ftp, etc. If you
5 T7 p! {1 h! C6 \) Y, ~are using SSH, the rules will block outgoing SSH connections which
allocate a privileged source port.

% {( Q2 G% H. g2 q  T1 z0 BThe firewall choices are:
0 - NONE: This script will not set any firewall rules. You are responsible
: ~% G1 N. \9 r% q4 g" q0 hfor ensuring the security of your machine. You are STRONGLY
" }# `, z0 D7 o2 Frecommended 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
+ ^$ a1 ?% C8 g# p, u6 c! V! g. e3 b/ ifor a LAN
Choose a type of firewall (0-2): 2
- H6 y" k! y! \: Q) k# P
Start this connection at boot time
. T) M$ c/ w$ a  K
9 b  c9 Y9 o; H0 M, oDo you want to start this connection at boot time?
Please enter no or yes (default no):yes

! @% y" e: H7 l, U8 r- u** Summary of what you entered **

Ethernet Interface: eth0
User name: ADSL用户名
6 u, N8 \' K' W5 zActivate-on-demand: No
: y4 H) \' P2 ?% m0 SPrimary DNS: 202.96.134.133
* H& O+ ~7 V# O) c: K' P  }7 DSecondary DNS: 202.96.168.68
& _) `, T+ \8 j$ TFirewalling: MASQUERADE
2 j" z# c" {$ C6 l8 g' EUser Control: yes
5 v/ R( J2 K- MAccept these settings and adjust configuration files (y/n)?y


/ _0 e: P3 i$ F% L3 {- @' j三、在/etc/rc.d/rc.local中加入如下：
7 Y! Z: ]7 @/ {- G4 U
# D/ U) b! V: J: recho 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE
1 `4 b& Z; H" [9 l
四、重新启动机器。就OK了。这有多简单