Unless you have multiple IP address from your ISP and a modem that supports it (most cases requires some type of a business account from your ISP) you cannot as you have only one IP address. What are you trying to achieve by using the two modems?

Hi,

 

Is it a kind of wifi that you need connect to it with username and password? Is there any other wireless router at your house? 

 

If ISP provides wifi for you to get internet with configuration parameters, then you need ensure that whether it can be wireless bridged by multiple devices, otherwise, you can connect one router to the wifi to get internet due to the limitation. 

 

While you can connect them like a daisy-chain. 

 

May it help and have a nice day. 

 

KALUX wrote

I use 2 TL-WR802N in client mode, they take internet via wifi from the same modem.

 

But I just can use 1 device at a time because otherwise, I got no internet connect when I use both at the same time.

 

How to be able to get 2 client mode wifi routeur having internet at the same time ?

 

Alexandre

 

Look up "double NAT" to see how to avoid.