nat-start question

I have a question for the nat-start script.

I want that a port is only available from one specific ip address.
So i added the following line:
iptables -t nat -I VSERVER 3 -p tcp -m tcp -s [specific ip] --dport 443 -j DNAT --to 192.168.1.10

I can now only open de web page from the specific ip address with my domain name.
This is working correctly.

Now i want to open de site within my own network with my domain name so i thought i add the same line with my external ip adress, but than it...

nat-start question