A Question About Routers

Hello guys, I am new here and i wanted to ask you a question thats bugging me from some time. Straight to the question, is there (I suppose those exist) a program or a way to sniff the information on a remote router (far far away from you) through WAN when you have the valid password and user name for it.

I have searched in google but all i could find was a RAT (Router Audit Tool ) for Cisco routers. I am sure that the router is not Cisco, it is TP-Link, don't know the exact model thou .

So, if some one of you knows about a software like that please tell me its name or just give me a hint what to try.

Thanks.