Is there any kind of program that alerts me when a device connects to my modem?

instead of going to my "connected clients" page?

I use a Linksys modem.

It does exist, but I can't find it ! (I did find a linux one)

But I thought of another idea (other than asking Linksys support)

You can log into your Modem (you'll need to confirm the modem's IP)
And then check the traffic
Pretty sure you can set this up for remote login too (if you're game)

Well hope someone finds.

And what I meant of "going to my connected clients page" is the one when you login to the modem and check that.
not checking in linksys support, cause they never actually answer.

So I don't want to do that all the time to check, just a prog to let me know if a device got connected.