router info

That's a wifi range extender you want a router. The extender is a WiFi repeater. Router has dhcp among other features that deal with IP distribution. Is your goal to extend your WiFi range, add ports to your cable provider connection? Or establish a network in your house where ip distribution is handled by a device other than your PC? All with or without WiFi. If you already have an internet provider that provides a means of hooking up you PC for intent it probably already has extra ports which will act as a switch, router, dhcp serrver and probably has WiFi. If no WiFi then you can a WiFi adapter. Introducing more than 1 dhcp server or router to a network is complex for the average person. Stay away from that if you already have one provided by your internet provider. flex does not support statically defined IP address...it requires something that it can broadcast dhcp to to get an ipadress. The simlpiest way is with a router like this (again bearing you don't already have one) http://www.amazon.co.uk/RT-AC3200-Tri-Band-Wireless-Broadband-Download/dp/B00Y2NVH4O/ref=sr_1_10?s=computers&ie=UTF8&qid=1444994229&sr=1-10&keywords=router

The last two are good options however,  I am never a fan of wireless routers without external antennas.  Those with internal antennas never seem to get the reach than those with external antennas.

I do want to point out, your current router is more than sufficient to operate the flex.  I have never measured more than 2 or 3 Mb/s using my 6300... If it works.. I would just keep it... If its defective then thats a different story.

Moderators should remove this before someone clicks on the link.