Your office Wi-Fi network is one of the most common attack surfaces in your entire IT infrastructure. Every device that connects to it, from employee laptops to smart printers to visitors' phones, is a potential entry point for an attacker. Despite this, many businesses still run flat networks with a single shared password that has not been changed in years.
Here are six steps to secure your office wireless network properly.
Use WPA3 Encryption (or WPA2-Enterprise at Minimum)
If your office network is still running WPA2-Personal with a shared password, it is time to upgrade. WPA3 provides stronger encryption, protects against offline dictionary attacks, and offers individualized data encryption even on open networks.
If your existing access points do not support WPA3, WPA2-Enterprise with RADIUS authentication is the next best option. Instead of a single shared password, each employee authenticates with their own credentials. This means you can revoke access for individual users without changing the password for everyone, which is critical when employees leave the company.
Isolate Your Guest Network
Visitors, contractors, and clients should never connect to the same network as your internal systems. A dedicated guest network with client isolation ensures that guest devices can access the internet but cannot see or communicate with any device on your internal network.
Best practices for guest networks include:
- Bandwidth throttling to prevent guests from consuming all available bandwidth
- Automatic session expiration (for example, 4 or 8 hours)
- A captive portal that requires acceptance of terms of use
- DNS filtering to block known malicious domains
Segment IoT Devices with VLANs
Smart TVs, IP cameras, printers, and other IoT devices are notoriously insecure. Many ship with default credentials, receive infrequent firmware updates, and run minimal security software. These devices should never share a network with your workstations and servers.
Create a dedicated VLAN for IoT devices with firewall rules that restrict their communication to only the services they need. A smart printer needs to receive print jobs from the internal network, but it does not need unrestricted access to your file server or email system. VLAN segmentation contains the blast radius if any IoT device is compromised.
Plan Your Access Point Placement
Poor AP placement creates two problems: dead zones where employees cannot get a reliable connection, and signal bleed outside your building where attackers can attempt to connect from the parking lot or a neighboring office.
Key principles for AP placement:
- Use a site survey tool (Ekahau, NetSpot, or even the free WiFi Analyzer app) to map coverage before and after installation
- Reduce exterior signal bleed by lowering transmit power on APs near windows and exterior walls
- Avoid co-channel interference by properly planning channel assignments, especially in the 2.4 GHz band where only three non-overlapping channels exist
- Mount APs on ceilings for the best omnidirectional coverage pattern
Keep Firmware Updated
Access points, routers, and wireless controllers all run firmware that contains security vulnerabilities. Manufacturers release patches regularly, but many businesses never apply them. A single unpatched AP can undermine every other security measure you have in place.
Set a recurring calendar reminder to check for firmware updates monthly. Enterprise-grade access points from manufacturers like Ubiquiti and Cisco support scheduled automatic updates, which removes the human element from the process entirely.
Monitor for Rogue Devices
A rogue access point is an unauthorized wireless device connected to your network, whether it is a malicious device planted by an attacker or an employee who plugged in a personal wireless router because the signal was weak at their desk. Either way, it is a security risk.
Enterprise wireless controllers from Ubiquiti (UniFi), Cisco (Meraki), and Aruba include built-in rogue AP detection. Enable it. Configure alerts so your IT team is notified immediately when an unknown wireless device appears on the network. Pair this with regular physical inspections of network closets and office spaces.
Get Professional Help
ITWorks sells and deploys Ubiquiti UniFi and Cisco networking equipment for businesses of all sizes. We handle everything from initial site surveys and network design to installation, VLAN configuration, and ongoing monitoring. Whether you are setting up a single-office network or a multi-floor deployment, we ensure your wireless infrastructure is fast, reliable, and secure.
Browse networking gear at shop.itworkslb.net or contact us for a site survey and custom deployment plan.