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[tbakerz1]

I am not a network engineer so bear with me. I currently have my Router configured and all traffic is working but there has to be a better way to configure this and that is why I am here.
Current config
Lets assume my IP's are the following
WAN IP 10.178.40.170
WANNET 255.255.255.224
WANGW 10.178.40.161
DMZ IP 10.178.41.17
DMZNET 10.178.41.16/28
The issue is that I have everything in the DMZ. 6 servers total but I only need 3 IP's to be external. The other IP's are for webhosting which are not being used at this time.
How can I configure this so that (lets say I use 172.100.10.xxx on the inside) I use my CIDR IP's for external/public and the 172 IP's for internal/private?
I only have one WAN and one DMZ so should I configure my DMZ as another WAN and configure a port on the LAN side to be the new DMZ?
I know a SAT/Allow rule will work with this setup. I am just looking for good tips on the best way to configure my particular setup. I have never dealt with CIDR.

Thanks for any help!

[tbakerz1]

Apparently no one else knows either. I guess I will play with the config. I wish someone could have at least responded with some type of answer.

[danilovav]

First, use http://www.subnet-calculator.com/ to calculate CIDR. Your wannet = 10.178.40.160/27

Next, do you plan to get new IP addresses from the same ISP with wan1 or new one?