{"id":5743,"date":"2026-09-16T08:00:00","date_gmt":"2026-09-16T08:00:00","guid":{"rendered":"https:\/\/www.netwayseurope.com\/?p=5743"},"modified":"2026-09-10T13:17:50","modified_gmt":"2026-09-10T13:17:50","slug":"how-to-encrypt-a-dci-connection-without-noticeable-speed-loss","status":"publish","type":"post","link":"https:\/\/www.netwayseurope.com\/en\/knowledgebase\/how-to-encrypt-a-dci-connection-without-noticeable-speed-loss\/","title":{"rendered":"How to Encrypt a DCI Connection Without Noticeable Speed Loss"},"content":{"rendered":"<p>Encrypting a DCI connection sounds straightforward, but in practice many organisations run into the same problem: encryption that noticeably impacts performance. Latency increases, throughput drops, and the IT department faces a difficult trade-off between security and speed. Fortunately, that trade-off is unnecessary in most cases.<\/p>\n<p>This guide walks you through step by step how to implement data center interconnect encryption without noticeable speed loss. From proper preparation to resolving common issues: after completing these steps, your DCI connection will be both secure and fast.<\/p>\n<h2>What you need before implementation<\/h2>\n<p>Good preparation prevents problems during implementation. Before you start encrypting your DCI connection, map out the current situation. That means: knowing what equipment is at both endpoints, what bandwidth is currently being used, and what the applicable latency requirements are for your applications.<\/p>\n<p>Make sure you have the following information and resources available:<\/p>\n<ul>\n<li>Technical documentation of the existing DCI connection, including interfaces and protocols used<\/li>\n<li>Insight into the maximum permitted latency budget per application or service<\/li>\n<li>Access to the management consoles of the equipment at both endpoints<\/li>\n<li>Knowledge of the transport protocol in use (Ethernet, OTN, SONET\/SDH)<\/li>\n<li>Clarity on the compliance requirements applicable to your sector, for example in healthcare or critical infrastructure<\/li>\n<li>Reserve capacity or a test window to temporarily test the connection without production risk<\/li>\n<\/ul>\n<p>Also verify whether the existing equipment supports hardware encryption. This is a crucial factor for performance, and you will return to this in more detail in a later step.<\/p>\n<h2>Choose the right encryption layer for your DCI<\/h2>\n<p>The choice between <a href=\"https:\/\/www.netwayseurope.com\/en\/products\/security\/encryption-solutions\/\">layer 1 encryption and layer 2 encryption<\/a> has direct implications for both the security and the performance of your DCI connection. Both approaches have their own area of application, and the right choice depends on your infrastructure and security requirements.<\/p>\n<h3>Layer 1 encryption<\/h3>\n<p>Layer 1 encryption, also known as optical or physical layer encryption, encrypts the entire bitstream at the level of the fibre optic connection. This provides maximum security because data is secured before higher-level protocols come into play. In addition, hardware-based layer 1 encryption introduces virtually no latency, making it ideally suited for latency-sensitive environments such as financial institutions, hospitals, and data centres with real-time replication.<\/p>\n<h3>Layer 2 encryption<\/h3>\n<p>Layer 2 encryption operates at the level of Ethernet frames and can be deployed more flexibly in networks that already use Ethernet-based transport technologies. It offers more granularity per VLAN or connection, but requires more precise configuration to prevent performance loss. This is a good choice if you want to combine encryption with segmentation at the network level.<\/p>\n<p>Choose layer 1 if you need the lowest possible latency and want to secure the connection end-to-end. Choose layer 2 if you want more control over individual data streams within the same infrastructure. In both cases: hardware-based processing is essential to avoid speed loss.<\/p>\n<h2>Configure the encryption equipment at both endpoints<\/h2>\n<p>After choosing the encryption layer, configure the equipment at both locations. Symmetrical configuration is the key word here: both endpoints must be configured identically, otherwise the connection will not be established or the encryption will fall back to a lower security mode.<\/p>\n<ol>\n<li>Ensure that the firmware of the encryption equipment at both locations is up to date and uses the same version.<\/li>\n<li>Configure the encryption standard. For DCI applications, AES-256 is the common choice due to the combination of strong security and hardware support in modern chipsets.<\/li>\n<li>Set the key exchange protocol. Preferably use a standardised protocol such as MACsec (for layer 2) or a vendor-specific protocol for layer 1 that is FIPS-certified.<\/li>\n<li>Configure the key rotation intervals. Shorter intervals increase security, but ensure that rotation does not cause connection interruptions by testing this in advance.<\/li>\n<li>Set the management interface to a separate out-of-band connection, so that management and production traffic remain strictly separated.<\/li>\n<\/ol>\n<p>After configuration, verify that the encryption status at both endpoints is active and that the key exchange has been completed successfully. Most encryption equipment displays a status message or LED indication confirming that the secure connection has been established. If the status is not green, first check the clock setting and time synchronisation between both locations, as a time difference is a common cause of failed key exchange.<\/p>\n<h2>Validate the connection and measure actual latency<\/h2>\n<p>With encryption active, the next step is measuring actual performance. Validation is not a formality: it is the only way to be certain that the encryption has no noticeable effect on the connection.<\/p>\n<ol>\n<li>Measure the round-trip latency with and without encryption active, under equal load. Use a measurement tool that measures accurately to the microsecond, especially in latency-sensitive environments.<\/li>\n<li>Test the maximum throughput under full load. Compare this with the baseline measurement from before the implementation.<\/li>\n<li>Run a packet loss test over a period of at least 15 minutes under realistic traffic.<\/li>\n<li>Check the key rotation during the test: verify that rotation occurs without measurable interruptions in the connection.<\/li>\n<\/ol>\n<p>A properly configured hardware encryption solution adds less than one microsecond of latency to the connection. If you measure more than a few microseconds of additional latency, this indicates that the encryption is being processed in software rather than via the hardware. In that case, optimisation is needed, which is addressed in the next step. Document all measurement results as a reference for future management and audits.<\/p>\n<h2>Optimise performance with hardware-based encryption<\/h2>\n<p>Software-based encryption places a significant load on the processor of the equipment, which is directly visible in higher latency and lower throughput. Hardware-based encryption processes the cryptographic operations in a dedicated chipset, completely transparent to the network. This is the core of encrypting DCI connections without speed loss.<\/p>\n<p>Check the following points to ensure you are fully utilising hardware encryption:<\/p>\n<ul>\n<li>Verify in the device specifications that encryption offload to the hardware chipset is enabled, not to the device&#8217;s CPU.<\/li>\n<li>Ensure that the MTU setting of the connection accounts for the overhead of the encryption headers. With MACsec, encapsulation adds extra bytes to each frame; an MTU that is too low causes fragmentation and increased latency.<\/li>\n<li>Disable unnecessary software-based security functions that cover the same layer as the hardware encryption, to avoid double processing.<\/li>\n<li>Verify that the equipment is certified for the encryption standard you are using. Non-certified implementations sometimes fall back to a software mode without warning.<\/li>\n<\/ul>\n<p>If you are unsure whether your current equipment supports hardware encryption at the desired speed, take a look at our <a href=\"https:\/\/www.netwayseurope.com\/en\/solutions\/security\/\">security solutions<\/a> for an overview of equipment specifically selected for DCI security without performance loss. We advise vendor-independently based on your specific situation.<\/p>\n<h2>Resolve common encryption issues<\/h2>\n<p>Even with a careful implementation, problems can occur. Below are the most common issues with DCI encryption and how to resolve them.<\/p>\n<h3>The encrypted connection cannot be established<\/h3>\n<p>First check the time synchronisation between both endpoints. A difference of more than a few seconds prevents a successful key exchange in most protocols. Synchronise both locations via a reliable time source and try to re-establish the connection.<\/p>\n<h3>Higher latency than expected after activation<\/h3>\n<p>This almost always points to software-based encryption processing. Check whether the hardware offload is actually active via the device status interface. Also check the MTU setting: fragmentation caused by an MTU that is too low is a second common cause of unexpected latency.<\/p>\n<h3>Connection drops periodically during key rotation<\/h3>\n<p>Some configurations cause a brief interruption when switching encryption keys. In that case, enable &#8220;hitless key rollover&#8221; or a similar feature if the equipment supports it. This ensures that the new key is active before the old one expires, without connection interruption.<\/p>\n<h3>Management of the encryption equipment is unreachable<\/h3>\n<p>If the management interface runs via the same path as production traffic, an encryption problem can also block management access. This is precisely why an <a href=\"https:\/\/www.netwayseurope.com\/en\/products\/security\/out-of-band-management\/\">out-of-band management connection<\/a> is essential. Always ensure you have an alternative management path that is independent of the production connection.<\/p>\n<p>With these steps you have a complete foundation to encrypt your DCI connection in a way that is both reliable and performance-neutral. Do you have questions about the right equipment selection, or would you like to discuss the security architecture for your specific situation? We are happy to think along with you, from advice to implementation.<\/p>\n<p style=\"margin:0; padding:0;\">&nbsp;<\/p>\n<div style=\"all:initial; display:block !important; box-sizing:border-box !important; background:#17225a !important; border-radius:10px !important; padding:32px 40px !important; font-family:Inter, sans-serif !important;\">\n<p style=\"all:unset; display:block !important; font-family:Poppins, sans-serif !important; font-size:19px !important; font-weight:700 !important; color:#ffffff !important; line-height:1.35 !important; margin:0 0 8px 0 !important; padding:0 !important;\">Ready for the next step?<\/p>\n<p style=\"all:unset; display:block !important; font-family:Inter, sans-serif !important; font-size:15px !important; font-weight:400 !important; color:#dbe6f3 !important; line-height:1.6 !important; margin:0 0 24px 0 !important; padding:0 !important;\">View our solutions or get in touch directly with one of our experts.<\/p>\n<div style=\"all:unset; display:flex !important; align-items:center !important; gap:12px !important; flex-wrap:wrap !important;\">\n <a href=\"https:\/\/www.netwayseurope.com\/en\/solutions\/\" style=\"all:unset !important; display:inline-flex !important; align-items:center !important; background:#ff4801 !important; color:#ffffff !important; font-family:Inter, sans-serif !important; font-size:15px !important; font-weight:600 !important; padding:13px 30px !important; border-radius:25px !important; cursor:pointer !important; text-decoration:none !important; line-height:1 !important;\">Read more \u2192<\/a><br \/>\n <a href=\"https:\/\/www.netwayseurope.com\/en\/contact\/\" style=\"all:unset !important; display:inline-flex !important; align-items:center !important; background:transparent !important; color:#ffffff !important; border:2px solid #ffffff !important; font-family:Inter, sans-serif !important; font-size:15px !important; font-weight:500 !important; padding:11px 28px !important; border-radius:25px !important; cursor:pointer !important; text-decoration:none !important; line-height:1 !important;\">Contact us<\/a>\n <\/div>\n<\/div>\n<p style=\"margin:0; padding:0;\">&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Encrypt your DCI connection without sacrificing speed. Discover how hardware encryption makes all the difference.<\/p>\n","protected":false},"author":6,"featured_media":5691,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86,79,81],"tags":[],"class_list":["post-5743","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq","category-knowledge-base","category-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Encrypt a DCI Connection Without Noticeable Speed Loss | Netways<\/title>\n<meta name=\"description\" content=\"Encrypt your DCI connection without performance loss? Learn step by step how hardware encryption secures your link. 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