title: mikrotik change src header ip in dst-nat
body: <p>in first sorry for my poor English.</p>
  <p>i have one dedicated server with several vm such as mikrotik, nginx and etc.
  mikrotik have 2 ethernet with public and local ip address. when i route port 80 and 443 with dst-nat to nginx, the request header change source ip to my local ip as gateway. for this reason several feature such as nginx ip restrict not working</p>
  <p>my nat config</p>
  <pre><code>/ip firewall nat
  add action=dst-nat chain=dstnat comment=&quot;Nginx - 172.16.10.50&quot; dst-address=\
      XXX.XXX.XXX.XXX dst-port=9522 protocol=tcp to-addresses=172.16.10.50 \
      to-ports=22
  add action=dst-nat chain=dstnat dst-address=XXX.XXX.XXX.XXX dst-port=443 \
      protocol=tcp to-addresses=172.16.10.50 to-ports=443
  add action=dst-nat chain=dstnat dst-address=7XXX.XXX.XXX.XXX dst-port=80 \
      protocol=tcp to-addresses=172.16.10.50 to-ports=80
  
  add action=masquerade chain=srcnat comment=internet
  </code></pre>