A Small Office Network That Does Not Fall Over
Most office network problems are not exotic. A router that has not been updated in three years, a guest using the same Wi-Fi as your point-of-sale system, a power blip that leaves the modem frozen, and nobody who remembers the admin password. You can prevent nearly all of it in an afternoon.
1. Put guests on their own Wi-Fi
Customers, vendors and visitors should never be on the same network as your computers, printers, and payment devices. Most business and recent consumer routers have a "guest network" setting. Turn it on and check these items:
- Give it a different name and a different password from your main Wi-Fi.
- Use WPA3 if the router offers it, or WPA2 with AES if not. Avoid "open" and avoid the old WEP and WPA settings.
- Make sure "client isolation" or "AP isolation" is on, so guest devices cannot see each other or your equipment. The name of this setting varies by brand.
- Test it. Connect a phone to the guest network and try to open your printer's page or a shared folder. It should fail.
Also put smart TVs, cameras, and other "internet of things" gadgets on the guest side if they do not need to talk to your computers.
2. Keep the router and its firmware current
- Log in to the router's admin page and find the firmware or "system" section.
- Note the model and the current version. Check the maker's support page for the newest one.
- Turn on automatic updates if the router supports it. If not, put a repeating reminder on your calendar every three months.
- Change the default admin password to a long, unique one. Turn off remote administration unless you truly need it.
- If the maker has stopped issuing updates for your model (look for "end of life" or "end of support"), plan to replace it. An unsupported router is a standing risk.
Do the same for Wi-Fi access points, switches, and printers if they are managed devices.
3. Put a UPS on the modem and router
A small uninterruptible power supply (UPS) keeps the modem and router running through short outages and smooths over brownouts and surges that cause the "it just needs to be unplugged" problem. You do not need a large one. Add up the watts of what you plan to plug in (the labels show it), and pick a unit rated comfortably above that. Runtime varies a lot by model, so read the runtime chart for your load. Plug in the modem, router, and main switch. Do not plug a laser printer into it, since printers can overload a small unit.
Press the test button on the UPS a couple of times a year. Batteries wear out, and most need replacing every few years, with the exact interval depending on the model.
4. Label everything
- Put a label on each end of every network cable saying where it goes (for example "Front desk" or "Printer").
- Label each port on the switch or patch panel to match.
- Label the power adapters for the modem and router, so no one unplugs them while cleaning.
- Put a sticker on the router with the date of the last firmware update.
5. Write down what you will need at 7 a.m. on a bad day
Keep one page, on paper in a drawer and a copy in your password manager:
- Internet provider name, account number, and support phone number.
- The router's admin address and login, and the Wi-Fi names and passwords.
- Model and serial numbers of the modem, router, switch, and UPS.
- A simple list of devices: what each one is and where it sits.
- How to restart things in the right order: modem first, wait for it to settle, then router, then the rest.
- The date the router was last updated and the date the UPS battery was last replaced.
Also back up the router's configuration file once it is set up the way you want, so a factory reset is a five-minute fix instead of an afternoon.