Protecting Your WiFi Network: How to Detect Unauthorized Users and Secure Your Connection

Introduction

In today’s digital age, a stable and secure WiFi network is essential for both work and leisure. However, the convenience of wireless connectivity also makes it susceptible to unauthorized access. The possibility of someone using your WiFi network without your knowledge can lead to various issues, such as slow internet speeds, data breaches, and potential security threats. In this article, we will discuss how to check if your WiFi network is being used by someone else without your permission and provide valuable tips on how to prevent such incidents.

Monitor Your Connected Devices

The first step in identifying unauthorized users on your WiFi network is to regularly monitor the list of connected devices through your router’s administration page. To access this page, you need to know your router’s IP address, which is often something like 192.168.1.1 or 192.168.0.1. Enter this address into your web browser,

Log in with your credentials, and navigate to the section displaying connected devices. If those IP addresses don’t work, you can go to your network configuration and check the default gateway there, which is usually your Wi-Fi access point.

In windows for example run IPCONFIG to check this

Once there, review the list of devices connected to your network. Ensure that each device listed is recognized and authorized. If you spot any unfamiliar devices, it’s a clear indication that someone might be using your network without your consent. You can disconnect these devices or even blacklist their MAC addresses to prevent further intrusions. This will depend on the interface of your console. Please refer to your router’s user manual on how to do it.

Utilize VLANs (Virtual Local Area Networks)

Virtual Local Area Networks, or VLANs, are an effective way to segment your network into smaller, isolated sub-networks. This can be especially useful if you want to create a separate network for guests or IoT devices while keeping your primary network secure. Unauthorized users on one VLAN won’t be able to access devices on other VLANs.

Setting up VLANs might require some technical expertise, so consult your router’s manual or reach out to Resonance Security if necessary.

Hide Your SSID

Your WiFi network’s Service Set Identifier (SSID) is its name that appears in the list of available networks when someone searches for WiFi connections. By default, SSIDs are visible, making your network an easy target for unauthorized users. To enhance security, consider hiding your SSID. Go to the Wi-Fi configuration in your router console. You will find the SSID name there and the option to hide it.

When your SSID is hidden, users must know the exact network name to connect, making it more challenging for unauthorized users to gain access. Remember though, that security through obscurity is not foolproof, and determined attackers can still discover hidden SSIDs.

Change Default Passwords

Many routers come with default login credentials, often printed on a sticker or available online. It’s imperative to change these defaults immediately upon setting up your router. Default usernames and passwords are well-known to attackers, and leaving them unchanged makes it easier for unauthorized users to gain access to your network.

Create a strong and unique password for your router’s administrative interface. It should include a mix of upper and lower-case letters, numbers, and special characters. Additionally, change the username from the default “admin” to something unique that only you know.

Use Strong WiFi Passwords

In addition to securing your router’s administrative interface, you must also set a strong password for your WiFi network itself. A strong WiFi password is a crucial line of defense against unauthorized access. Aim for a long, complex passphrase that includes a combination of letters, numbers, and symbols. As we discussed in the past, please use passphrases that are at least 12 characters long. You can refer to our previous article on how easy it is for AI to break your password.

Avoid using easily guessable information like birthdays, names, or common words. Instead, create a memorable passphrase by using a phrase or sentence and modifying it with special characters and numbers. Regularly update your WiFi password to enhance security.

Regularly Check Your Network Traffic

Monitoring your network traffic can provide valuable insights into any unusual or suspicious activities. You can use various network monitoring tools and software to track the data flow on your network, such as DataDog or SolarWinds. Look for unusual spikes in traffic, unrecognized devices, or data transfers during odd hours.

Additionally, consider enabling intrusion detection systems (IDS) and intrusion prevention systems (IPS) if your router supports them. These tools can automatically detect and block unauthorized access attempts and malicious activity on your network.

Enable MAC Address Filtering

Each device connected to a network has a unique Media Access Control (MAC) address. You can take advantage of MAC address filtering to create a list of approved devices that are allowed to connect to your WiFi network. By configuring your router to only accept connections from MAC addresses on this list, you can prevent unauthorized devices from accessing your network.

While MAC address filtering adds an extra layer of security, it’s essential to note that MAC addresses can be spoofed, so it shouldn’t be your sole security measure.

Firmware Updates and Security Patches

Router manufacturers regularly release firmware updates and security patches to address vulnerabilities and improve performance. Ensure that your router’s firmware is up to date by visiting the manufacturer’s website or using the router’s built-in update feature. Keeping your router’s software current helps protect it from known exploits that unauthorized users may attempt to exploit.

Conclusion

Securing your WiFi network and detecting unauthorized users is a vital aspect of maintaining a safe and efficient online environment. By monitoring connected devices, utilizing VLANs, hiding your SSID, changing default passwords, using strong WiFi passwords, checking network traffic, enabling MAC address filtering, and keeping your router’s firmware up to date, you can significantly reduce the risk of unauthorized access and potential security breaches.

Remember that cybersecurity is an ongoing process, and staying vigilant is essential. Regularly review and update your security measures to stay one step ahead of potential threats. By taking these precautions, you can enjoy a secure and reliable WiFi network for all your online activities.

About the Author:

Luis Lubeck is a cybersecurity expert and a member of the Resonance Security team, specializing in awareness and project management.

Resonance Security https://resonance.security

Follow us on LinkedIn https://www.linkedin.com/company/resonance-security/