units=63

IP4='IPV4ｱﾄﾞﾚｽ'
PSID='MAP-E_PSID'
LANDEV='LANｲﾝﾀｰﾌｪｲｽ'
WAN6DEV='WANｲﾝﾀｰﾌｪｲｽ'
TUNDEV='MAP-Eｲﾝﾀｰﾌｪｲｽ'

iptables -t nat -F PREROUTING
iptables -t nat -F OUTPOUT
iptables -t nat -F POSTROUTING

rule=1
while [ $rule -le $units  ] ; do
  mark=`expr $rule + 16`
  pn=`expr $rule - 1`
  portl=`expr $rule \* 1024 + $PSID \* 16`
  portr=`expr $portl + 15`

  iptables -t nat -A PREROUTING -p tcp -m statistic --mode nth --every $units --packet $pn -j MARK --set-mark $mark
  iptables -t nat -A OUTPUT -p tcp -m statistic --mode nth --every $units --packet $pn -j MARK --set-mark $mark

  iptables -t nat -A POSTROUTING -p icmp -m connlimit --connlimit-daddr --connlimit-upto 16 --connlimit-mask 0 -o $TUNDEV -j SNAT --to $IP4:$portl-$portr
  iptables -t nat -A POSTROUTING -p tcp -o $TUNDEV -m mark --mark $mark -j SNAT --to $IP4:$portl-$portr
  iptables -t nat -A POSTROUTING -p udp -m connlimit --connlimit-daddr --connlimit-upto 16 --connlimit-mask 0 -o $TUNDEV -j SNAT --to $IP4:$portl-$portr

  rule=`expr $rule + 1`
done

sleep 5

iptables -t nat -A PREROUTING -i $LANDEV -j zone_lan_prerouting
iptables -t nat -A PREROUTING -i $WAN6DEV -j zone_wan_prerouting
iptables -t nat -A PREROUTING -i $TUNDEV -j zone_wan_prerouting

iptables -t nat -A POSTROUTING -o $LANDEV -j zone_lan_postrouting
iptables -t nat -A POSTROUTING -o $WAN6DEV -j zone_wan_postrouting
iptables -t nat -A POSTROUTING -o $TUNDEV -j zone_wan_postrouting