{"id":4257,"date":"2026-07-19T06:00:00","date_gmt":"2026-07-19T06:00:00","guid":{"rendered":"https:\/\/www.netwayseurope.com\/?p=4257"},"modified":"2026-07-20T13:48:10","modified_gmt":"2026-07-20T13:48:10","slug":"can-layer-1-encryption-be-combined-with-existing-firewalls-and-vpn","status":"publish","type":"post","link":"https:\/\/www.netwayseurope.com\/en\/can-layer-1-encryption-be-combined-with-existing-firewalls-and-vpn\/","title":{"rendered":"Can layer 1 encryption be combined with existing firewalls and VPNs?"},"content":{"rendered":"\n

Yes, layer 1 encryption can be combined with existing firewalls and VPNs<\/strong> without having to modify your current infrastructure. Because physical encryption takes place at OSI layers 1 and 2, it operates completely transparently to all higher network layers, including the software and systems used by firewalls and VPNs. In this article, we answer the most frequently asked questions about how this combination works, when it offers advantages, and how to make the right choice for your situation.<\/p>\n\n\n\n

Does layer 1 encryption operate at the same level as firewalls and VPNs?<\/h2>\n\n\n\n

No, layer 1 encryption operates at a fundamentally different level than firewalls and VPNs. Firewalls operate at OSI layer 3 and above, analyzing IP packets and application traffic. VPNs encrypt data at layer 3 or 4. Layer 1 encryption<\/strong> protects data traffic at the physical transmission layer, before the network even begins routing or filtering.<\/p>\n\n\n\n

This means the three technologies do not overlap \u2014 they complement each other. A firewall controls who has access and which traffic is permitted. A VPN encrypts the transport of data across public networks. Layer 1 encryption, also known as OSI layer 1 encryption<\/strong> or physical network encryption, protects the transmission itself at the lowest level of the network. Each of these layers secures a different attack surface. If you are looking for a broader overview of how these technologies fit together, our security solutions<\/a> page provides a useful starting point.<\/p>\n\n\n\n

Because layer 1 encryption is transparent to higher layers, a firewall or VPN system is not even aware of it. Traffic is encrypted and decrypted within the transmission infrastructure, without higher-level systems noticing or being affected in any way.<\/p>\n\n\n\n

How does combining layer 1 encryption with an existing VPN work?<\/h2>\n\n\n\n

When combining layer 1 encryption and a VPN<\/strong>, you secure data traffic at two separate levels simultaneously. A VPN encrypts data at the application or transport level. Layer 1 encryption then re-encrypts the entire bitstream at the physical layer, including traffic already encrypted by the VPN. This creates layered security without the systems interfering with each other.<\/p>\n\n\n\n

In practice, this works as follows: your VPN client or gateway encapsulates and encrypts data traffic as usual. That encrypted traffic is then transported through the physical network infrastructure, where encryption solutions at layer 1 add a second security layer. Nothing changes for the end user or the VPN system. The latency impact is minimal, because physical encryption is handled in hardware.<\/p>\n\n\n\n

This principle is also known as “defence in depth.” Even if an attacker manages to break the VPN encryption, they still encounter the physical encryption layer. Both layers must be compromised before an actual data breach can occur.<\/p>\n\n\n\n

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Explore our solutions or get in touch with one of our experts directly.<\/p>\n

\n Read more \u2192<\/a>\n Get in touch<\/a>\n <\/div>\n<\/div>\n<\/p>\n\n\n

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Ready for the next step?<\/p>\n

Explore our solutions or get in touch with one of our experts directly.<\/p>\n

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What are the benefits of layer 1 encryption alongside a firewall?<\/h2>\n\n\n\n

A firewall protects your network against unauthorized access and malicious traffic, but offers no protection against physical eavesdropping on cable infrastructure. Layer 1 encryption alongside a firewall<\/strong> closes exactly that gap. Even if someone gains physical access to a fiber-optic connection or cable route, the intercepted signal is unreadable.<\/p>\n\n\n\n

The benefits at a glance:<\/p>\n\n\n\n