Wireless printing greatly simplifies work in the home office and business, allowing you to send documents from any device without the hassle of wires. However, an open Wi-Fi network to which your printer is connected creates a potential vulnerability through which hackers can access your documents or use your device to attack other devices.
Restricting access to a network printer is a critical step for ensuring information security, especially if you frequently connect guest devices or work in an apartment building with a dense router coverage area. Modern printers offer a wide range of security tools, but these are often disabled by default for user convenience.
In this article, we'll explore effective methods for preventing unauthorized access to your printer using router settings and the device's built-in security features. You'll learn how to isolate printing, set up filtering, and protect your data from unauthorized viewing.
The risks of open access to a network printer
Many users underestimate the threats associated with connecting a printer to a shared Wi-Fi network, viewing it simply as a peripheral device for text output. In reality, modern MFPs are fully-fledged computers with an operating system, memory, and a network interface, making them an attractive target for hackers looking for loopholes in their home network.
Leak of confidential information This most often occurs because documents sent to print can be temporarily stored in the device's internal memory or even on the hard drive, in the case of enterprise models. Without proper security, anyone connected to your Wi-Fi can intercept the data stream or access the scanned file archive.
Furthermore, an unprotected printer can become an entry point for attacks on other devices on the network, such as laptops running banking apps or smart home systems. Attackers exploit vulnerabilities in printer firmware to inject malicious code, which then spreads to users' computers.
- 🛑 Interception of documents during printing or scanning by unauthorized persons.
- 🛑 Using a printer as a botnet for DDoS attacks on third-party resources.
- 🛑 Gaining access to the internal network through vulnerabilities in the printer's network protocols.
⚠️ Important: If your printer supports remote printing via cloud services, make sure your account is protected with a strong password and two-factor authentication, otherwise someone could access your device even from another country.
Setting an administrator password on the printer itself
The first and most obvious security step is to change the factory password for accessing the device's web management interface. By default, most manufacturers set standard combinations like "admin/admin" or "admin/1234," which are easily found in open databases online.
To change the settings, you need to know your printer's IP address, which is usually displayed on the device's screen or printed in the network configuration report. Entering this address into the address bar of a browser on a computer connected to the same network will take you to the control panel, where in the section Security or Settings You can set a new password.
After changing the password, access to changing network settings, including closing ports and configuring protocols, will be restricted to you only. This prevents accidental or malicious configuration changes by other network users, even if they know the device's IP address.
- 🔐 Use a combination of letters, numbers, and special characters with a minimum length of 12 characters.
- 🔐 Avoid using personal information, such as birth dates or pet names.
- 🔐 Update your printer firmware regularly through the menu
Firmware Updateto eliminate security holes.
Where can I find my printer's IP address?
On most devices, the IP address can be found by clicking the "Wireless" or "Report" button on the control panel. The address is also often displayed on a small screen when you hover over the Wi-Fi icon. As a last resort, you can print a network configuration page from the service menu.
Using MAC address filtering on a router
The most effective method for blocking printer access from unwanted devices is to use MAC address filtering on the router. Each network adapter has a unique identifier that cannot be changed programmatically, allowing you to create a "whitelist" of trusted devices.
To implement this protection, you need to go into your router settings, usually at 192.168.0.1 or 192.168.1.1, and find the section Wireless -> Wireless MAC FilteringActivate the filtering function and select the "Allow" mode, then add the MAC addresses of only those computers and smartphones that are allowed to print.
Once the settings are applied, any devices whose addresses aren't on the list will be physically unable to print documents, even if they know the Wi-Fi password. This creates a reliable barrier to guests or neighbors who might accidentally or intentionally connect to your network.
☑️ Setting up MAC filtering
It's important to note that this method requires manually adding each new device you want to connect to the printer in the future. If you frequently change devices or host many guests, this process can be cumbersome, but the security is worth it.
Setting up a guest Wi-Fi network for the purpose
Modern routers allow you to create a separate guest Wi-Fi network that's completely isolated from your main home network. This is ideal for situations where you need to provide internet access to guests but absolutely don't want them to access your printers, NAS drives, or computers.
By enabling the function Guest Network In the router settings, you create a virtual access point with its own name and password. The main advantage is the option AP Isolation or "Client Isolation," which prevents devices on the guest network from seeing each other and devices on the main network, including the printer.
By connecting guests' smartphones to the guest Wi-Fi, you automatically block their access to the printer, as they are on a completely different network segment. However, your personal devices connected to the main network continue to see the printer and can print documents without interruption.
| Parameter | Main network | Guest network |
|---|---|---|
| Access to the printer | Eat | No (closed) |
| Access to PC files | Eat | No |
| Password | Complex, known to you | Simple, for guests |
| Device isolation | No | Yes (AP Isolation) |
Disabling cloud features and remote printing
Many modern printers have cloud printing features enabled by default, such as HP ePrint, Epson Connect or Google Cloud Print (for older models). These services allow you to print documents from anywhere in the world, but if you don't use them, they leave you open to potential internet attacks.
To ensure maximum access protection, we recommend completely disabling these features in the printer's web interface or through the manufacturer's mobile app. This ensures the device is accessible only within the local network and will not listen for commands from the outside world.
It's also worth checking your data transfer protocol settings. Disable old and insecure protocols, such as FTP or Telnet, unless they are used for specific tasks. Leave them enabled only HTTPS for the web interface and standard printing protocols required for operation.
⚠️ Note: Printer settings interfaces may vary depending on the manufacturer. If you don't see the option to disable cloud connectivity, check the official documentation for your model, as the menu location may change with firmware updates.
Disabling external services not only improves security, but can also speed up your printer's performance, as the device stops constantly polling the manufacturer's servers for new jobs.
Blocking ports and protocols
For advanced users seeking the highest level of protection, manual firewall configuration is available on the router or printer itself. Network printing typically occurs through ports 9100 (RAW), 515 (LPD), or 631 (IPP), and blocking access to these ports for specific IP addresses effectively blocks printing.
In your router settings, you can create rules that block incoming connections to printer ports for all devices except those within a trusted IP address range. For example, you can allow printing only from devices with static IP addresses in the range 192.168.1.10 to 192.168.1.50.
This method requires precise knowledge of network architecture and can be challenging for beginners, but it provides granular control over traffic. If a device attempts to send data to the printer port without following standard procedures, the firewall will simply drop the packets.
- 🔒 Port 9100 is the main port for direct TCP/IP printing, the most frequently used.
- 🔒 Port 631 - used for the IPP protocol, often used in macOS and Linux.
- 🔒 Port 515 is an outdated LPD protocol that is best disabled unless used by older software.
Keep in mind that overly complex settings may make the printer unvisible to your own devices. Always test printing after making changes to your firewall rules.
FAQ: Frequently Asked Questions
Is it possible to completely disable Wi-Fi on a printer and print only via cable?
Yes, most network printers allow you to completely disable the wireless module in the network settings menu. This will only allow the device to operate when connected via Ethernet or USB, which physically blocks wireless access.
Will hiding the network name (SSID) protect my printer from being accessed?
Hiding the SSID isn't a reliable security method, as knowledgeable users can easily detect hidden networks using specialized software. A printer connected to a hidden network will still be vulnerable unless additional encryption and filtering methods are used.
What should I do if the printer itself changes its IP address and the settings become lost?
To resolve this issue, you need to reserve an IP address for the printer in your router's DHCP settings. This will bind the printer's MAC address to a specific IP address, ensuring it remains constant, which is important for the stable operation of access filters.
Is it dangerous to leave AirPrint or Mopria running?
AirPrint and Mopria protocols are secure within a trusted home network because they don't require driver installation and operate locally. However, if someone else connects to your Wi-Fi, they will be able to see the printer via these protocols, so it's more important to secure the Wi-Fi access point itself.