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一个在LINUX下运行的东西

#!/bin/bash
PATH="$PATH:/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/locale/sbin"
if [ "x$1" == "xon" ];then 
 modprobe iptable_nat
 echo 1 > /proc/sys/net/ipv4/ip_forward
 iter=ppp0
 [ -z $2 ] || iter=$2
 iptables -t nat -A POSTROUTING -o $iter -j MASQUERADE
elif [ "x$1" == "xoff" ];then
 echo 0 > /proc/sys/net/ipv4/ip_forward
else 
 exit 1;
fi
exit 0;