# add route
        /sbin/ifconfig | /usr/bin/tail -n 10 | /bin/grep 'inet addr:' > ./tfile
        /bin/sed 's/inet addr://g' ./tfile > ./tfile1
        ip=`/bin/cat ./tfile1 | /usr/bin/awk '{print $1}'`
        # /sbin/route add -net $server_ip gw $ip netmask 255.255.0.0
        # /sbin/route delete mue
        /sbin/route add default gateway $ip
        rm ./tfile
        rm ./tfile1
        echo $ip
        # enable NAT
        echo "1" > /proc/sys/net/ipv4/ip_forward
        /sbin/iptables -F
        /sbin/iptables -P INPUT ACCEPT
        /sbin/iptables -P FORWARD ACCEPT
#        /sbin/iptables -t nat -A PREROUTING -d $ip -j DNAT --to-destination 192.168.1.100
#        /sbin/iptables -t nat -A PREROUTING -d $ip -p tcp --dport 8000 -j DNAT --to-destination 192.168.1.100:8000
        /sbin/iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE