Question : Natting

I have a 2 MBPS internet leased line connection and cisco 1841 series router with 2 fast ethernet. In ISP side for WAN they are given 2 ip's one is configured with my Router WAN interfaceand another one is configured with ISP's router.

For LAN interface ISP given 30 (mask bit 27) usable public ips. In my environment i don't have firewall so i don't use any public ip in my router LAN interface. I configured LAN interface with private ip only.

For LAN users internet connection i used natting with WAN ip (110.110.100.xxx), so they are able to access the internet. and i have 5 webservers, for outside users i configured natting with 5 different ports.

So outside users can reach my webser through the below urls.

http://110.110.100.xxx:80 for 1st server.
http://110.110.100.xxx:81 for 2ns server.
.
.
.
http://110.110.100.xxx:84 for 5th server.

My problem is i don't have firewall and i am using privite ip in my router LAN interface. My customer don't want to put the port number in end of the url. i have 30 usable public ips. so  i need to do natting my websers with these public ips. And i don't need to change my LAN segment ip.

ISP given 2 segment of ip.
1 is 110.110.100.xxx / 30 (Used in WAN Segment).
2 is 110.110.200.xxx / 27 (Never used in any where).

How to use these public ips in my environment without firewall and how to configure natting for my webservers, without mention the port number.  

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Network Diagram

Answer : Natting

give a secondary ip to your wan interface with yyy segment ip.....