You might find these tools or information helpful when setting up your gateway server
Account Management
Functions to help management the current account
Change Password
Password Updated
IP Address to CIDR
No experience with CIDR notations? Here are some tools you can use to make setting up easier.
IP Range to CIDR Conversion
Note that the CIDR generated here covers additional IP address before or after the given range. If you need more details settings, please use CIDR with a smaller range and add additional IPs for detail range adjustment.