iptables 做網關

 #!/bin/bash
START() {
        echo "NAT is start...."
        echo "1" > /proc/sys/net/ipv4/ip_forward
        /sbin/iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -j SNAT --to-source  10.0.0.0.1
}
STOP() {
        echo "NAT is stop..."
        echo "0" >/proc/sys/net/ipv4/ip_forward
        /sbin/iptables -t nat -F
}
STATUS() {
        /sbin/iptables -t nat -L POSTROUTING
}
case $1 in
        start)
                START
                ;;
        stop)
                STOP
                ;;
        status)
                STATUS
                ;;
        restart)
                STOP
                START
                echo "NAT is restart..."
                ;;
        *)
                echo "Usage: $0 {start|stop|restart|status}"
esac
~