How to change my T3200M modem's subnet Mask

[wireless]

I had to relocate my personal nas from another home to my new place. As a result, my NAS is no longer detected in my new home network. I have read that its because the telus modem has a different subnet mask. My nas has a subnet mask of 255.255.252.0, while the telus modem is 255.255.255.0. How can i get these two devices to talk to another and restore my ability to use my NAS?



More... (https://forum.telus.com/t5/Internet-Home-Phone/How-to-change-my-T3200M-modem-s-subnet-Mask/m-p/123999#M30744)