CentOS - Apr 2017 - DNAT Internet gate problem on centos

Hello Guys,

I got trouble to get vserver work as gate:

GATE=XX.XX.XX.XX

YY_PORT=YY

echo "1" > /proc/sys/net/ipv4/ip_forward

iptables -F -t nat

iptables -t nat -A PREROUTING -p tcp -i venet0:0 --dport $YY_PORT \
       -j DNAT --to-destination $GATE:$YY_PORT

iptables -t nat -A POSTROUTING -p tcp --dport $YY_PORT \
       -j MASQUERADE


iptables -L -t nat


Any suggestion? I got it in the past, but now I'm completely confused.

Thanks for help.

Sincerely

Andy

On the GATE it works. (Port mapping)

Now i know why you wait, when I ask. Depends on time I will find a (my)
way. :-)

#!/bin/sh
IPTBLV4=/usr/sbin/iptables

if [ $# -eq 0 ]
  then
    echo "No arguments supplied"
   GATE=XX.XX.XX.XX
  else
   GATE=$1
fi

nslookup $GATE

echo "1" > /proc/sys/net/ipv4/ip_forward

$IPTBLV4 -F -t nat

$IPTBLV4 -t nat -A PREROUTING -p tcp --dport PORT1 -j DNAT
--to-destination $GATE:PORT1
$IPTBLV4 -t nat -A PREROUTING -p tcp --dport PORT2 -j DNAT
--to-destination $GATE:PORT2

.
.
.
.

#global 
$IPTBLV4 -t nat -A POSTROUTING -j MASQUERADE

$IPTBLV4 -L -t nat -v

/usr/sbin/service iptables save 

This works on the vserver to the gate -> transparent to local gate ->
transparent to network again -> local machines.

Why? I don't like my provider, but he's the fastest and cheapest in
town. 

The people of today are just too curious.

Sincerely

Andy