Guest Wi-Fi: offer internet access without opening your business network

A customer arrives for a meeting and asks for Wi-Fi. Sharing the password used by the whole team is convenient, but it leaves an important question unanswered: which resources will their device be able to reach?

Define what visitors need to do

In a simple case, visitors need internet access from reception or a meeting room. They do not need the file server, router administration page or employee workstations. Write down this scope before configuring equipment.

Cisco documentation distinguishes guest internet access, separation from the internal network and isolation between guests. These are different functions to check on the equipment installed.

A second name is not enough

Creating a Wi-Fi network called “Visitors” does not prove that its traffic is filtered. Equipment and network rules must enforce separation, for example through a dedicated logical network with appropriate filtering. Configuration depends on the router, access points and switches.

Ask the administrator to confirm that management interfaces are also inaccessible to guests. A welcome portal or password does not replace this check.

Protect business use

Decide who provides access and how it is renewed. If the internet connection is shared, review the bandwidth limits and priorities supported by your equipment. Set them according to need; guest Wi-Fi does not create additional internet capacity.

For a small meeting room, testing during a normal video call is more meaningful than a speed test in an empty office.

Three checks with your administrator

• Open a public website from an authorised test device on guest Wi-Fi.
• Confirm that the internal resources listed in the test plan are inaccessible.
• From the business network, check that the team’s normal tasks still work.

If guest-to-guest isolation is required, check it with two devices authorised for the exercise. Record results and any exceptions. One blocked attempt does not prove that the entire network is correctly filtered.

Our business network security service helps define access around your premises and working practices.