What are the pitfalls in a PC router?

Question

Computer networks

Good day to all friends.
This is where I got food for thought.
At home I have a Dlink 620th, with firmware from Kinetics, a 3G modem is plugged into it (there is no way to get the Internet anymore). I need to do some manipulations with the speed, plus measuring the traffic on the tariff, etc. On kinetics, this cannot be realized, and there is no OpenWRT for my modem yet, but I can’t assemble it myself.
Therefore, I thought to use an unnecessary netbook (or build a mini stationary one), install Linux, plug a modem into it, plug in a Wi-Fi module, install the necessary programs and display the results from them on a separate HTML page, which will be available at a typical address 192.168.1.1.
Plugging a 3G modem directly into my main laptop is not an option - I often drag it around the house, I don’t want something sticking out of it + the router itself reconnects the modem when the connection is interrupted.
Tell us about your experiences in such cases, throw links, as well as any other advice, I will be very happy.
For example, which Linux is better to install (honestly, I’m weak in this. As I understand it, it’s better to install a version server?)
In the future, by the way, I’m going to install a TV with a whistle and organize local storage for a couple of terabytes so that I can access it from TV, laptop and phone . It is obvious that it is the PC that will best deal with this, but will there be a loss of speed for the installed full-fledged OS?

Answer 1

There are no pitfalls, just setting up this whole thing is quite exhausting and without experience you can either not understand how to set it up, or set it up wrong.
Depending on the model of the 3G modem, there may be dances with a tambourine with it.
I recommend Ubuntu Server.

Answer 2

choose from Linux distributions-routers
google https://www.google.com/search?num=20&newwindow=1&q...
+ as an example www.smoothwall.org