Arris SB6190 no internet on NetGear Nighthawk R7900P

I bought and installed an Arris SB6190 and called Xfinity support to get it activated.  All works fine when connected to my laptop via RJ45 and I'm connected to the internet. 

When I connect to the internet port on my NetGear R7900P there is no IP address.  Should the SB6190 give me a DHCP address?  When I'm connected to my laptop and look at network settings it says DHCP and I get a 73.x.x.x range address.  If I release and renew the IP does not change.

 The SB6190 has software version 9.1.103AA65L.

Do I need to set a manual IP on my Netgear?  If so, what's the best DNS server IP's to use?  Also, do I need to set a username and login for the connection and would that be my Xfinity account username and password?

Thanks