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一、操作环境：

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
3 ?: M0 Q2 f* k& aADSL，乙太口，非路由。
8 f5 h! D3 ?0 v. A
' J* L6 V+ X1 A+ V二、网卡设置如下：
0 R( ~3 C! B5 U: e# ^6 E& c2 f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。
. X+ C5 V) X4 M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
* j+ y9 I! h0 s8 s4 \* eip地址:192.168.0.2
掩码：255.255.255.0
在这两块网卡中，不要设置网关。
++++++++++++++++++++++++++++++++++++++++
第二台：Toshiba notebook的网卡设置
IP：192.168.0.6
4 O2 o; q; J! n' {- G掩码：255.255.255.0
网关：192.168.0.1
# J6 y7 k' ]( l- t2 KDNS:设置电信给的，或者下面的也行
202.96.134.133
! T6 U  G) w4 I; ^) f202.96.168.68
++++++++++++++++++++++++++++++++++++++++
第三台机器的网卡设置
P：192.168.0.8
掩码：255.255.255.0
网关：192.168.0.1
4 d8 U+ Y2 m$ mDNS:设置电信给的，或者下面的也行
) d1 p6 H2 N  @: p" ~" _# o& d202.96.134.133
202.96.168.68
" }. J/ Z9 S% J三、设置ppp拔号，
9 r$ }9 ^% j+ Q! `9 k1]删除原来的ppp的ADSL链接。
- k8 |( T9 G8 Y3 F( d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
( y" C# B6 R1 g9 U$ n' r* p
2]在终端上以root权限运行
( i4 ]! J0 k6 l$ B+ p#adsl-setup
" a, Q3 A0 O2 Z+ D) D
3 D/ D) A- P0 ^4 k0 f+ ^$ R* m
[root@LinuxSir02 root]# adsl-setup
" h+ P8 ]5 k6 Z6 h5 }3 O% V& m
Welcome to the ADSL client setup. First, I will run some checks on
your system to make sure the PPPoE client is installed properly...


! c- C7 H* O# K" S- _8 @LOGIN NAME
: m3 x. f( K( ^9 D, R/ i
+ N% i; K4 _* I4 r9 zEnter your Login Name (default root): ADSL提供商给的用户名，写在这里

INTERFACE
- N& G, [" G0 g# J/ l  v: @) v
Enter the Ethernet interface connected to the ADSL modem
  G; ?8 l6 L+ `; kFor Solaris, this is likely to be something like /dev/hme0.
For Linux, it will be ethX, where 'X' is a number.
9 C* [( C! e3 `1 f' _(default eth0): eth0这是ADSL通过第一台机器的第一张网卡eth0提供上网

1 F& y/ y$ }! y; d
( V( `' O$ J2 B- eDo you want the link to come up on demand, or stay up continuously?
; n5 T3 r* l2 O7 I  }" X. LIf 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
) N4 }0 J2 h0 R, zstay 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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DNS

; l: K, g- x4 W) Y: w. dPlease enter the IP address of your ISP's primary DNS server.
, x% }' d- |) c, Z# TIf your ISP claims that 'the server will provide dynamic DNS addresses',
% n: N4 E9 ]+ _: m$ s# x: @" Fenter '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: 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.
9 z/ {1 c8 t* R: oIf 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。
! r% @- J- A% ]' l3 _7 `5 s: `
! {1 v! d- M) h# ?' ^: U6 KPASSWORD

6 x$ E- S& u$ K) d1 T: APlease enter your Password:在这里把ADSL提供商给的密码写上
Please re-enter your Password:
% `# Q. [/ Y) [4 E
USERCTRL
" \# b. `5 P: j1 |) P$ Y% i# W, {
0 N7 u1 g& Y; i) J. ^+ X/ f* @Please enter 'yes' (two letters, lower-case.) if you want to allow
- j. o  y' K- _# h4 `1 N( |normal user to start or stop DSL connection (default yes): yes

$ ~) g4 H, |  E' ~9 l( N# LFIREWALLING

Please choose the firewall rules to use. Note that these rules are
# {- s% O7 l6 h- P% q) Uvery basic. You are strongly encouraged to use a more sophisticated
firewall setup; however, these will provide basic security. If you
* n5 e. `4 V+ g, r5 uare 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
3 _+ }, b) f8 \$ T, X/ ]) Q9 J' I3 [are using SSH, the rules will block outgoing SSH connections which
allocate a privileged source port.
) {! V1 P' f3 X) ~6 z
  C# v: z$ Z, }' IThe 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.
. g9 h0 n# b+ @# c5 Q! N1 - STANDALONE: Appropriate for a basic stand-alone web-surfing workstation
2 - MASQUERADE: Appropriate for a machine acting as an Internet gateway
1 H/ |; T; ?" w. j: I, Zfor a LAN
Choose a type of firewall (0-2): 2
  V8 r; p3 i4 ?: S) x
0 e, d: Z  p  s. b# D* LStart this connection at boot time

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

7 m7 P6 z5 p4 C** Summary of what you entered **

Ethernet Interface: eth0
5 P7 ]9 |6 T; e( _User name: ADSL用户名
2 k5 R) J% ?6 f2 M  {Activate-on-demand: No
Primary DNS: 202.96.134.133
6 F, _, W, I9 K7 h! F( A. eSecondary DNS: 202.96.168.68
Firewalling: MASQUERADE
2 b/ ?& ?, Z9 hUser Control: yes
Accept these settings and adjust configuration files (y/n)?y


" {! D! l8 c5 Y0 |) ~, |) G6 u三、在/etc/rc.d/rc.local中加入如下：

, R+ i, h: K& Jecho 1 > /proc/sys/net/ipv4/ip_forward
: }9 Y" m6 ^: u( @$ O  V- s* miptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE

8 `# Q9 G7 I0 t* R2 N四、重新启动机器。就OK了。这有多简单