what do I need

[pia321]

I have just bought a router asus ac 66 do I need a modem to get this to work and what modem do you recommend

 

[USAFRet]

That is only a router, not a modem-router combination. So yes, you probably need some sort of modem.
What modem you need depends on your ISP and their technology (Cable/DSL/other). What modem does your ISP recommend?

 

[pia321]

Thanks for your answer, I will check whit my ISP.