由 zhangxin_tmx 在 09-02-2004 15:32 发表:
急切地问一个iptables的问题
我的系统是RedHat 9.0,内核版本是2.4.20-8,iptables版本是V1.2.7a,我移植了一个在另一服务器上运行得很好的脚本,但该脚本在我的机器上运行总是有问题。
我想通过该脚本使我内部局域网的计算机能连Internet。
脚本如下:
#!/bin/sh
configuration options
LAN_IP_RANGE="10.44.0.0/16"
LAN_IP="10.44.0.1"
LAN_BCAST_ADRESS="10.44.255.255"
LAN_IFACE="eth1"
INET_IP="166.111.44.10"
INET_IFACE="eth0"
LO_IP="127.0.0.1"
LO_IFACE="127.0.0.1"
IPTABLES="/sbin/iptables"
#echo "Starting iptables rules..."
Load all required IPTables modules
Needed to initially load modules
/sbin/depmod -a
Adds some iptables targets like LOG, REJECT and MASQUARADE.
/sbin/modprobe ipt_LOG
/sbin/modprobe ipt_MASQUERADE
/sbin/modprobe ip_tables
/sbin/modprobe ip_nat_ftp
/sbin/modprobe ip_conntrack_ftp
Delete old PREROUTING chain
$IPTABLES -t nat -F PREROUTING
#------------------------------------------------------------------------------
$IPTABLES -t nat -A PREROUTING -s 192.168.0.0/16 -j DROP
$IPTABLES -t nat -A PREROUTING -s 10.0.0.0/8 -j DROP
$IPTABLES -t nat -A PREROUTING -s 172.16.0.0/12 -j DROP
#------------------------------------------------------------------------------
Delete old POSTROUTING chain
$IPTABLES -t nat -F POSTROUTING
MASQ to INET_IFACE
$IPTABLES -t nat -A POSTROUTING -o $INET_IFACE -j MASQUERADE
set SNAT
$IPTABLES -t nat -A POSTROUTING -s $LAN_IP_RANGE -j SNAT --to $INET_IP
Delete old INPUT chain
$IPTABLES -F INPUT
Drop ports in PREROUTING
#$IPTABLES -A INPUT -p tcp -i $INET_IFACE -d $INET_IP --dport 10021 -j RETURN
port:22
$IPTABLES -A INPUT -p tcp -i $INET_IFACE -s 166.111.44.200/32 -d $INET_IP --dport 22 -j ACCEPT
$IPTABLES -A INPUT -p tcp --dport 22 -j DROP
disable port 1 to 1024
$IPTABLES -A INPUT -p tcp --dport 1:1024 -j RETURN
$IPTABLES -A INPUT -p udp --dport 1:1024 -j RETURN
Delete old Forward chain
$IPTABLES -F FORWARD
set natlog train
$IPTABLES -F natlog
$IPTABLES -A natlog -p tcp --syn -j LOG --log-prefix "nat_tcp: " --log-ip-options
$IPTABLES -A natlog -p udp -j LOG --log-prefix "nat_udp: " --log-ip-options
Log all forward
$IPTABLES -A FORWARD -j natlog
该脚本运行时提示如下:
[root@Test-Proxy root]# ./setip.sh
iptables: no chain/target/match by that name
iptables: no chain/target/match by that name
iptables: no chain/target/match by that name
iptables v1.2.7a: Couldn't load target 'natlog':/lib/iptables/libipt_natlog.so:cannot open shared object file: No such file or directory
我逐一手动执行了一下该脚本,发现是以下几个语句的问题:
$IPTABLES -F natlog
$IPTABLES -A natlog -p tcp --syn -j LOG --log-prefix "nat_tcp: " --log-ip-options
$IPTABLES -A natlog -p udp -j LOG --log-prefix "nat_udp: " -