First of all I don't know what subcategory this goes in so if an admin feels it belongs in a different section please do move it.
Our small business just moved into a new building and I am in charge of setting up the network infrastructure. I am not new to computers or networking but I have never had to deal with this set up before. So I will try and explain our current set up, what we need and hopefully someone much more educated on the subject can help me.
Our current set up
We have a cable modem from comcast that has the Coax cable connected to it.
The modem has 4 ports on it. The ports are connected to a built in 24 port switch that was already in the building. The switch has it's ports connected to outlets in the walls. Currently we have 4 computers on our network and since the cable modem had 4 ports it worked fine.
What we need
We will have another person join our office so I will need to activate one additional port on the switch that already exists. However, since all 4 ports on the modem are already taken, I have no way to add an additional port.
They also want us to get wifi in the building.
How I think I have to solve the problem (most likely wrong)
I have to get another switch (like 8 port) and connect the cable modem to the switch using a cross over cable (if there is no designated internet port). Since I have the modem connected to the switch, I will have to move the 3 remaining connections to the switch.
Then I connect the 4 remaining ports on the switch to the existing 24-port switch that is already there.
I will use one of the outlets in the building to connect an AP for Wi-Fi for better signal.
Currently the modem and switches are hidden in a closet away from the office space and would mess up the signal.
Am I looking at this the right way or am I missing something?
Let's clarify something first. Is this really only a modem? Or is it possibly a modem+router (two components in a single device)?
I’m asking because most modems only have a single LAN port. And unless you have a business account, the ISP only allows a single, dynamic, public IP over that LAN port. You then need a router (to which you connect its WAN port to the modem) to support more than one user. Sometimes the cable provider gives you only a modem (you must bring the router yourself), or sometimes provides both, usually in the form of a single device (modem+router).
Which brings me full circle; is this perhaps a modem+router, or is it ONLY a modem?
If you’re not sure, then provide some make & model details and we’ll check it out.