Want some advices on modem

I recently upgraded to 300 mbps plan and Xfinity sent me an XB7-CM modem. But now I am still using with old SB6183 modem and my own router. and am hesitant to switch to the new XB7-CM because I don't want to lose the following functions provided by my current router. Can someone tell if XB7-CM supports them?

1. Dynamic DNS
2. VPN Server (I have a VPN server on my current router working with Dynamc DNS)
3. DHCP Reservation for specific devices
4. Separate Wifi SSID for 2.4GHz and 5 GHz
5. Port-forwarding