请教大家：我用电信专线怎样通过用redhat9做代理，让局域网内都能上网？

sncel516

请教大家：我用电信专线怎样通过用redhat9做代理，让局域网内都能上网？我在本论坛找了很多资料，但都是关于adsl的，请大家指教，谢谢！
我的IP:
eth0:203.94.26.18
eth1:192.168.96.22

[ 本帖最后由 sncel516 于 2005-11-23 17:07 编辑 ]

yanjfb

用IPTABLE!!

traveller2

原帖由 yanjfb 于 2005-11-24 00:28 发表
用IPTABLE!!

要双网卡,查点关于把LINUX做成路由器的资料吧.
用NAT或则用SQUID把机器做成透明代理都是可以实现共享上网.

platinum

原帖由 traveller2 于 2005-11-24 06:44 发表


要双网卡,查点关于把LINUX做成路由器的资料吧.
用NAT或则用SQUID把机器做成透明代理都是可以实现共享上网.

单网卡也可

missing-cn

某人大人的Nat脚本，简单修改了一下使之符合你的情况，请参考。

1. 
   
2. #!/bin/bash
   
3. #
   
4. # Script name: ipt_masq
   
5. # A simple script for masquerading, used in Linux (kernel 2.4.x).
   
6. #
   
7. # Now Ready for Kernel 2.6.x  
   
8. #
   
9. # Copyleft 2002 by netman (netman@study-area.org).
   
10. #
    
11. # Redistribution of this file is permitted under the terms of
    
12. # the GNU General Public License (GPL).
    
13. #
    
14. # Date: 2002/02/04
    
15. # Version: 1.2
    
16. 
    
17. PATH=/sbin:/usr/sbin:/bin:/usr/bin
    
18. RC_SQUID=/etc/rc.d/init.d/squid
    
19. EXT_IF=eth0
    
20. INT_IF=eth1
    
21. ALLOWED_ICMP="0 3 3/4 4 11 12 14 16 18"
    
22. DENIED_ICMP="8"
    
23. 
    
24. #
    
25. # ------------- ensure iptables ----------
    
26. which iptables &>/dev/null || {
    
27. echo
    
28. echo "$(basename $0): iptables program is not found."
    
29. echo " Please install the program first."
    
30. echo
    
31. exit 1
    
32. }
    
33. # ------------- disable ipchains ----------
    
34. lsmod | grep ipchains &>/dev/null && {
    
35. echo "Disabling ipchains..."
    
36. rmmod ipchains &>/dev/null
    
37. }
    
38. 
    
39. # ------------- modules -----------
    
40. echo "Loading modules..."
    
41. modprobe ip_tables &>/dev/null || {
    
42. echo -n "$(basename $0): loading ip_tables module failure."
    
43. echo " Please Fix it!"
    
44. exit 3
    
45. }
    
46. for file in /lib/modules/`uname -r`/kernel/net/ipv4/netfilter/ip_conntrack_*.ko
    
47. do
    
48. module=$(basename $file)
    
49. modprobe ${module%.*} &>/dev/null
    
50. done
    
51. for file in /lib/modules/`uname -r`/kernel/net/ipv4/netfilter/ip_nat_*.ko
    
52. do
    
53. module=$(basename $file)
    
54. modprobe ${module%.*} &>/dev/null
    
55. done
    
56. 
    
57. 
    
58. # ------------- ipforwarding -----------
    
59. echo "Turning on IP forwarding..."
    
60. echo "1" > /proc/sys/net/ipv4/ip_forward
    
61. 
    
62. # ------------- anti spoofing -----------
    
63. echo "Turning on anti-spoofing..."
    
64. for file in /proc/sys/net/ipv4/conf/*/rp_filter; do
    
65. echo "1" > $file
    
66. done
    
67. 
    
68. # ------------- flushing ----------
    
69. echo "Cleaning up..."
    
70. iptables -F -t filter
    
71. iptables -X -t filter
    
72. iptables -Z -t filter
    
73. iptables -F -t nat
    
74. iptables -X -t nat
    
75. iptables -Z -t nat
    
76. 
    
77. # ------------- policies -------------
    
78. echo "Setting up policies to ACCEPT..."
    
79. iptables -P INPUT ACCEPT
    
80. iptables -P OUTPUT ACCEPT
    
81. iptables -P FORWARD ACCEPT
    
82. iptables -t nat -P PREROUTING ACCEPT
    
83. iptables -t nat -P POSTROUTING ACCEPT
    
84. iptables -t nat -P OUTPUT ACCEPT
    
85. 
    
86. # ------------- ICMP -------------
    
87. echo "Creating icmpfilter chain..."
    
88. iptables -N icmpfilter
    
89. for TYPE in $DENIED_ICMP; do
    
90. iptables -A icmpfilter -i $EXT_IF -p icmp --icmp-type $TYPE -j DROP
    
91. 
    
92. done
    
93. for TYPE in $ALLOWED_ICMP; do
    
94. iptables -A icmpfilter -i $EXT_IF -p icmp --icmp-type $TYPE -j ACCEPT
    
95. done
    
96. 
    
97. # ------------- block -------------
    
98. echo "Creating block chain..."
    
99. iptables -N block
    
100. iptables -A block -m conntrack  --ctstate ESTABLISHED,RELATED -j ACCEPT
     
101. iptables -A block -m state --state ESTABLISHED,RELATED -j ACCEPT
     
102. iptables -A block -m state --state NEW,INVALID -i $EXT_IF -j DROP
     
103. iptables -A block -m state --state NEW -i ! $EXT_IF -j ACCEPT
     
104. iptables -A block -j DROP
     
105. 
     
106. # ------------- filter -------------
     
107. echo "Filtering packets..."
     
108. iptables -A INPUT -j icmpfilter
     
109. iptables -A INPUT -j block
     
110. iptables -A FORWARD -j icmpfilter
     
111. iptables -A FORWARD -j block
     
112. 
     
113. # ------------- masq -------------
     
114. echo "Masquerading internel network..."
     
115. # if you have a dynamically ip for EXT_IF , Use it as follow.
     
116. #iptables -t nat -A POSTROUTING -o $EXT_IF -j MASQUERADE  
     
117. # if you have static ip for EXT_IF , USE it as follow
     
118. iptables -t nat -A POSTROUTING -s 192.168.1.22/24  -j SNAT --to-source 203.94.26.18
     
119. 
     
120. # ------------- tproxy -------------
     
121. $RC_SQUID status | grep pid &>/dev/null && {
     
122. echo "Enabling transparent proxy..."
     
123. INT_IP=$(ifconfig | grep "$INT_IF " -A 1  
     
124. | awk '/inet/ {print $2}' | sed -e s/addr://)
     
125. if [ -z "$INT_IP" ]; then
     
126. echo
     
127. echo "$(basename $0): there is no IP found on $INT_IF."
     
128. echo " Please make sure $INT_IF is setup properly."
     
129. echo
     
130. exit 3
     
131. fi
     
132. iptables -t nat -A PREROUTING -d $INT_IP -i $INT_IF  
     
133. -p tcp -m tcp --dport 80 -j ACCEPT
     
134. iptables -t nat -A PREROUTING -i $INT_IF -p tcp -m tcp  
     
135. --dport 80 -j REDIRECT --to-ports 3128
     
136. }
     
137. exit 0
     
138. ## EOS
     

复制代码

[ 本帖最后由 missing-cn 于 2005-11-24 14:30 编辑 ]

sncel516

请问missing-cn ：
这些脚本都是写在一个文件里吗？应该写在哪个文件中呢？
多谢missing-cn 指点！

sncel516

难道只有这一种办法吗，这样做是不是太复杂了
不能像adsl那样简单明了吗？

llzqq

把下面的内容放到一个文件中（可执行文件），然后执行就可以：


#!/bin/bash
# llzqq, 02/28/2004

export PATH=/sbin:/usr/sbin:/bin:/usr/bin

echo 1 >/proc/sys/net/ipv4/ip_forward

iptables -F
iptables -X
iptables -Z


iptables -A INPUT -i eth0 -j ACCEPT
iptables -A OUTPUT -o eth0 -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT


iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE

iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A FORWARD -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

platinum

少了
iptables -t nat -F
iptables -t nat -X
^_^

lxc521

原帖由 llzqq 于 2005-11-25 16:59 发表
把下面的内容放到一个文件中（可执行文件），然后执行就可以：


#!/bin/bash
# llzqq, 02/28/2004

export PATH=/sbin:/usr/sbin:/bin:/usr/bin

echo 1 >/proc/sys/net/ipv4/ip_forward

iptables ...

这样就可以让内网和外网互通了吗，lo 也可以这样用的吗，如果用IPROUTE配是不是要简单些呢