问下单网卡ADSL共享设置方法

Ainuo

ADSL接交换机uplink口... 网卡接交换机....

系统ubuntu 5.4

看了好多文章都是双网卡共享的... 不知道单网卡如何配置?

Chowroc

如果你是ADSL拨号上网，把那些资料中的 eth1 或 eth0 换成 ppp0。

florist

修改adsl-start启动脚本如下（MDV LE2005），加入了共享代码：

1. #!/bin/sh
   
2. # Generated automatically from adsl-start.in by configure.
   
3. #***********************************************************************
   
4. #
   
5. # adsl-start
   
6. #
   
7. # Shell script to bring up an ADSL connection
   
8. #
   
9. # Copyright (C) 2000 Roaring Penguin Software Inc.
   
10. #
    
11. # $Id: adsl-start.in,v 1.8 2002/04/09 17:28:39 dfs Exp $
    
12. #
    
13. # This file may be distributed under the terms of the GNU General
    
14. # Public License.
    
15. #
    
16. # LIC: GPL
    
17. #
    
18. # Usage: adsl-start [config_file]
    
19. #        adsl-start interface user [config_file]
    
20. # Second form overrides USER and ETH from config file.
    
21. # If config_file is omitted, defaults to /etc/ppp/pppoe.conf
    
22. #
    
23. #***********************************************************************
    
24. 
    
25. # From AUTOCONF
    
26. prefix=/usr
    
27. exec_prefix=/usr
    
28. 
    
29. # Paths to programs
    
30. CONNECT=/usr/sbin/adsl-connect
    
31. ECHO=/bin/echo
    
32. IFCONFIG=/sbin/ifconfig
    
33. 
    
34. # Set to "C" locale so we can parse messages from commands
    
35. LANG=C
    
36. export LANG
    
37. 
    
38. # Defaults
    
39. CONFIG=/etc/ppp/pppoe.conf
    
40. USER=""
    
41. ETH=""
    
42. ME=`basename $0`
    
43. # Must be root
    
44. if [ "`/bin/id -u`" != 0 ] ; then
    
45.     $ECHO "$ME: You must be root to run this script" >& 2
    
46.     exit 1
    
47. fi
    
48. 
    
49. # Debugging
    
50. if [ "$DEBUG" = "1" ] ; then
    
51.     $ECHO "*** Running in debug mode... please be patient..."
    
52.     DEBUG=/tmp/pppoe-debug-$$
    
53.     export DEBUG
    
54.     mkdir $DEBUG
    
55.     if [ "$?" != 0 ] ; then
    
56.         $ECHO "Could not create directory $DEBUG... exiting"
    
57.         exit 1
    
58.     fi
    
59.     DEBUG=$DEBUG/pppoe-debug.txt
    
60. 
    
61.     # Initial debug output
    
62.     $ECHO "---------------------------------------------" > $DEBUG
    
63.     $ECHO "* The following section contains information about your system" >> $DEBUG
    
64.     date >> $DEBUG
    
65.     $ECHO "Output of uname -a" >> $DEBUG
    
66.     uname -a >> $DEBUG
    
67.     $ECHO "---------------------------------------------" >> $DEBUG
    
68.     $ECHO "* The following section contains information about your network" >> $DEBUG
    
69.     $ECHO "* interfaces.  The one you chose for PPPoE should contain the words:" >> $DEBUG
    
70.     $ECHO "* 'UP' and 'RUNNING'.  If it does not, you probably have an Ethernet" >> $DEBUG
    
71.     $ECHO "* driver problem." >> $DEBUG
    
72.     $ECHO "Output of ifconfig -a" >> $DEBUG
    
73.     $IFCONFIG -a >> $DEBUG
    
74.     $ECHO "---------------------------------------------" >> $DEBUG
    
75.     if [ "`uname -s`" = "Linux" ] ; then
    
76.         $ECHO "* The following section contains information about kernel modules" >> $DEBUG
    
77.         $ECHO "* If the module for your Ethernet card is 'tulip', you might" >> $DEBUG
    
78.         $ECHO "* want to look for an updated version at http://www.scyld.com" >> $DEBUG
    
79.         $ECHO "Output of lsmod" >> $DEBUG
    
80.         lsmod >> $DEBUG
    
81.         $ECHO "---------------------------------------------" >> $DEBUG
    
82.     fi
    
83.     $ECHO "* The following section lists your routing table." >> $DEBUG
    
84.     $ECHO "* If you have an entry which starts with '0.0.0.0', you probably" >> $DEBUG
    
85.     $ECHO "* have defined a default route and gateway, and pppd will" >> $DEBUG
    
86.     $ECHO "* not create a default route using your ISP.  Try getting" >> $DEBUG
    
87.     $ECHO "* rid of this route." >> $DEBUG
    
88.     $ECHO "Output of netstat -n -r" >> $DEBUG
    
89.     netstat -n -r >> $DEBUG
    
90.     $ECHO "---------------------------------------------" >> $DEBUG
    
91.     $ECHO "Contents of /etc/resolv.conf" >> $DEBUG
    
92.     $ECHO "* The following section lists DNS setup." >> $DEBUG
    
93.     $ECHO "* If you can browse by IP address, but not name, suspect" >> $DEBUG
    
94.     $ECHO "* a DNS problem." >> $DEBUG
    
95.     cat /etc/resolv.conf >> $DEBUG
    
96.     $ECHO "---------------------------------------------" >> $DEBUG
    
97.     $ECHO "* The following section lists /etc/ppp/options." >> $DEBUG
    
98.     $ECHO "* You should have NOTHING in that file." >> $DEBUG
    
99.     $ECHO "Contents of /etc/ppp/options" >> $DEBUG
    
100.     cat /etc/ppp/options >> $DEBUG 2>/dev/null
     
101.     $ECHO "---------------------------------------------" >> $DEBUG
     
102. else
     
103.     DEBUG=""
     
104. fi
     
105. 
     
106. # Sort out command-line arguments
     
107. case "$#" in
     
108.     1)
     
109.         CONFIG="$1"
     
110.         ;;
     
111.     3)
     
112.         CONFIG="$3"
     
113.         ;;
     
114. esac
     
115. 
     
116. if [ ! -f "$CONFIG" -o ! -r "$CONFIG" ] ; then
     
117.     $ECHO "$ME: Cannot read configuration file '$CONFIG'" >& 2
     
118.     exit 1
     
119. fi
     
120. 
     
121. . $CONFIG
     
122. 
     
123. # Check for command-line overriding of ETH and USER
     
124. case "$#" in
     
125.     2|3)
     
126.         ETH="$1"
     
127.         USER="$2"
     
128.         ;;
     
129. esac
     
130. 
     
131. # Check for pidfile
     
132. if [ -r "$PIDFILE" ] ; then
     
133.     PID=`cat "$PIDFILE"`
     
134.     # Check if still running
     
135.     kill -0 $PID > /dev/null 2>&1
     
136.     if [ $? = 0 ] ; then
     
137.         $ECHO "$ME: There already seems to be an ADSL connection up (PID $PID)" >& 2
     
138.         exit 1
     
139.     fi
     
140.     # Delete bogus PIDFILE
     
141.     rm -f "$PIDFILE" "$PIDFILE.pppd" "$PIDFILE.pppoe" "$PIDFILE.start"
     
142. fi
     
143. 
     
144. echo $$ > $PIDFILE.start
     
145. 
     
146. # Start the connection in the background unless we're debugging
     
147. if [ "$DEBUG" != "" ] ; then
     
148.     $CONNECT "$@"
     
149.     exit 0
     
150. fi
     
151. 
     
152. $CONNECT "$@" > /dev/null 2>&1 &
     
153. CONNECT_PID=$!
     
154. 
     
155. if [ "$CONNECT_TIMEOUT" = "" -o "$CONNECT_TIMEOUT" = 0 ] ; then
     
156.     exit 0
     
157. fi
     
158. 
     
159. # Don't monitor connection if dial-on-demand
     
160. if [ "$DEMAND" != "" -a "$DEMAND" != "no" ] ; then
     
161.     exit 0
     
162. fi
     
163. 
     
164. # Monitor connection
     
165. TIME=0
     
166. while [ true ] ; do
     
167.     /usr/sbin/adsl-status $CONFIG > /dev/null 2>&1
     
168. 
     
169.     # Looks like the interface came up
     
170.     if [ $? = 0 ] ; then
     
171.         # Print newline if standard input is a TTY
     
172.         tty -s && $ECHO " Connected!"
     
173.         ################ added for pppoe sharing ##################
     
174.         INET_FACE="$(ls /proc/sys/net/ipv4/conf | grep ppp)"
     
175.         INET_ADDR="$(ifconfig ${INET_FACE} | awk -F: '{print $2}' | awk '{print $1}' | grep '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}')"
     
176.         #Reset firewall
     
177.         iptables -P INPUT ACCEPT
     
178.         iptables -P FORWARD ACCEPT
     
179.         iptables -P OUTPUT ACCEPT
     
180.         iptables -t nat -P PREROUTING ACCEPT
     
181.         iptables -t nat -P POSTROUTING ACCEPT
     
182.         iptables -t nat -P OUTPUT ACCEPT
     
183.         iptables -t mangle -P PREROUTING ACCEPT
     
184.         iptables -t mangle -P OUTPUT ACCEPT
     
185.         iptables -F
     
186.         iptables -t nat -F
     
187.         iptables -t mangle -F
     
188.         iptables -X
     
189.         iptables -t nat -X
     
190.         iptables -t mangle -X
     
191. 
     
192.         #Start firewall
     
193.         iptables -P INPUT DROP
     
194.         iptables -A INPUT -i ! $INET_FACE -j ACCEPT
     
195.         iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
     
196.         iptables -A INPUT -p tcp -i $INET_FACE -j REJECT --reject-with tcp-reset
     
197.         iptables -A INPUT -p udp -i $INET_FACE -j REJECT --reject-with icmp-port-unreachable
     
198. 
     
199.         iptables -P FORWARD DROP
     
200.         iptables -A FORWARD -i ! $INET_FACE -j ACCEPT
     
201.         iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
     
202. 
     
203.         #Enable IP forwarding
     
204.         echo 1 > /proc/sys/net/ipv4/ip_forward
     
205. 
     
206.         #Use snat
     
207.         iptables -t nat -A POSTROUTING -o $INET_FACE -j SNAT --to-source $INET_ADDR
     
208.         #################### end of pppoe sharing code ###########
     
209.         exit 0
     
210.     fi
     
211. 
     
212.     if test -n "$FORCEPING" ; then
     
213.         $ECHO -n "$FORCEPING"
     
214.     else
     
215.         tty -s && $ECHO -n "$PING"
     
216.     fi
     
217.     sleep $CONNECT_POLL
     
218.     TIME=`expr $TIME + $CONNECT_POLL`
     
219.     if [ $TIME -gt $CONNECT_TIMEOUT ] ; then
     
220.         break
     
221.     fi
     
222. done
     
223. 
     
224. $ECHO "TIMED OUT" >& 2
     
225. # Timed out!  Kill the adsl-connect process and quit
     
226. kill $CONNECT_PID > /dev/null 2>&1
     
227. 
     
228. # Clean up PIDFILE(s)
     
229. rm -f "$PIDFILE" "$PIDFILE.pppd" "$PIDFILE.pppoe" "$PIDFILE.start"
     
230. 
     
231. exit 1

复制代码

memory

服务器端2条指令搞定：
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -o ppp+ -j MASQUERADE

客户端就不用说了吧。
服务器端拨号成功后局域网中其他机器（192.168.1.0/24）就可以上网了。

syyuning

如果猫带路由功能的话，就用不着双网卡了。。。配置起来也挺容易的。。

纯羊绒

猫带路由性能很局限，往往会造成带宽无法达到原有的速度。不推荐使用。