One of my business clients is a small restaurant. They currently have a comcast router (DNS - 10.x.x.x) for their office and they have a Netgear N600 Wireless Band Gigabit router (model WNDR3700v4) plugged into it to provide a guest wireless network. (DNS - 192.x.x.x).
The customers frequently complain about poor, slow performance. This is not my area of expertise. I'm used to simple home-based wireless networks.
Where should I start? New router? Add wireless APs to dining room? Both?
Any advice would be greatly appreciated!