Top 8 Data Diodes for Cross-Domain Solutions in Defense
Defense and intelligence networks span multiple security classifications that must never touch directly. A data diode enforces one way transfer between these domains at the hardware level. This closes a gap that firewalls and software rules cannot guarantee. Cross-domain solutions build on that hardware foundation to support real missions, from ISR feeds to coalition file sharing.
Buyers in this space face a mix of pure hardware diodes, software-augmented gateways, and fully accredited platforms. Certification pathway matters as much as throughput. Programs under National Cross Domain Strategy and Management Office rules need Raise the Bar compliance. Critical infrastructure operators more often look for Common Criteria evaluation instead.
The eight vendors below span this range, from tactical field deployments to high-throughput data center interconnects.
Data Diode and Cross-Domain Solution Comparison
| Vendor | Key Feature / Strength | Max Throughput |
|---|---|---|
|
Diode capability built into existing TAP and packet broker hardware |
Not disclosed |
|
|
FPGA-based Protocol Filtering Diode, National Cross Domain Strategy and Management Office Baseline listed |
Up to 100 Gbps |
|
|
XTS Diode integrates with XTS Guard cross-domain solution |
Up to 32 Gbps |
|
|
Only commercial off the shelf developer with Access and Transfer solutions on the Raise the Bar list |
Not disclosed |
|
|
Unidirectional gateway pioneer, deep industrial protocol connector library |
Up to 10 Gbps |
|
|
Swedish Armed Forces approved to Top Secret classification |
Up to 1 Gbps |
|
|
TACDS tactical cross-domain solution for vehicles, aircraft, and UAVs |
Not disclosed |
|
|
Hardware data diode line paired with a wider OT TAP and packet broker portfolio |
Not disclosed |
Network Critical
Network Critical builds data diode capability into its existing network TAP and packet broker hardware. It does not ship the function as a separate appliance. This avoids adding another vendor relationship and another console to a defense network that already carries enough complexity. The approach enforces one way transmission for logs, metrics, and files. Data moves from a secure or classified network to a lower-trust environment only. It is protocol agnostic across IP-based traffic, which removes configuration overhead that protocol-specific diodes can introduce.
The SmartNA-PortPlus packet broker scales from 48 to 194 ports across 1G to 100G speeds. It delivers 1.8 Tbps of non-blocking system throughput for aggregation and filtering ahead of the diode boundary. Passive Fiber Optical TAPs provide zero-power access up to 100G, ideal for tap points feeding a classified enclave. INVIKTUS adds Zero Trust cybersecurity with an invisible network presence. This suits defense buyers who need both segmentation and stealth. Drag-n-Vu software gives network admins a graphical configuration layer instead of command line complexity.
The hybrid TAP and packet broker architecture combines passive access, traffic management, and enforced unidirectional flow in one chassis. This simplifies the conduit architecture that segmentation frameworks like IEC 62443 require. Deploying separate appliances for each function adds complexity this approach avoids.
Proven results:
- Airbus: Completed first flight test objectives on schedule using Network TAPs deployed across multiple test rigs
- State of Maryland: Achieved compliant, auditable network monitoring across a government IP voice migration
- Darktrace: Integrated SmartNA-PortPlus with API-driven threat detection for continuous protective monitoring
Owl Cyber Defense
Owl Cyber Defense builds its Protocol Filtering Diode around Field-Programmable Gate Arrays. These inspect and filter every packet at the hardware level. The company's diodes sit on the National Cross Domain Strategy and Management Office Baseline. This certification pathway typically supersedes standard Common Criteria evaluation for government buyers. The flagship Talon Torrent line scales to 100 Gbps for backbone-level data movement. The compact Talon One delivers up to 1 Gbps through a single PCIe card. The OPDS-1000 offers three throughput tiers between 26 Mbps and 1,000 Mbps in a 1U rack-mountable chassis. Owl's customer base spans ISR feeds, command and control telemetry, and continuous SOC and SIEM monitoring for defense agencies.
BAE Systems
BAE Systems supplies the XTS Diode, a Raise the Bar compliant one way transfer device. It is validated by the National Cross Domain Strategy Management Office and the National Security Agency. The diode reaches up to 32 Gbps of throughput while staying compact enough for tactical and mobile deployments. It runs on BAE's STOP high assurance operating system or Red Hat Enterprise Linux. Forward error correction is built in to recover messages after one way transmission. The XTS Diode integrates with BAE's XTS Guard cross-domain solution and supports both UDP and TCP-based file sharing. Its primary market is defense, the intelligence community, and coalition partners needing documented compliance evidence for accreditation.
Everfox
Everfox was formerly known as Forcepoint's federal government division. It is the only commercial off the shelf developer with Access and Transfer solutions on the Raise the Bar list. This recognition comes from the National Cross Domain Strategy Management Office. The portfolio supports both bidirectional and unidirectional data transfer between mission networks, partners, and systems. Everfox solutions are built around Zero Trust principles. Every transfer is inspected, and policy compliance is validated before a data move is approved. The company serves US Defense, intelligence, and Five Eyes partner agencies. Its platform targets coalition operations, where multiple classification boundaries must interoperate at mission speed.
Waterfall Security Solutions
Waterfall Security Solutions pioneered the unidirectional gateway category. It remains one of the most widely deployed names in operational technology security. The flagship WF-600 gateway offers 1 Gbps or 10 Gbps throughput options, with standard high availability configurations included. Unlike a pure hardware diode, Waterfall's gateways pair the transfer hardware with protocol connectors and server replication software. This gives the platform a deep connector library spanning ABB, AVEVA, Emerson, GE, and Honeywell industrial systems. This depth suits defense-adjacent infrastructure, such as base utilities and building management systems. It is a less natural fit for classified data transfer between security domains. The company's core customer base sits in critical infrastructure and manufacturing rather than tactical defense deployments.
Advenica
Advenica is a Swedish high assurance vendor founded in 1993 and based in Malmö. It specializes in defense, government, and critical infrastructure cybersecurity. Its SecuriCDS Data Diode range includes the DD1G series for compact, DIN rail-mounted deployments. The DD1000A and DD1000i models suit 19 inch rack environments. All models are designed in hardware only, with optical separation ensuring the unidirectional function cannot be misconfigured. The SecuriCDS DD1000A and DD1000i are approved by the Swedish Armed Forces at component assurance level N3. This permits use up to Top Secret classification. Full Gigabit Ethernet throughput is available across the range. This positions Advenica for European defense buyers who prioritize national and EU-level security approvals over US-centric certification paths.
General Dynamics Mission Systems
General Dynamics Mission Systems developed the Tactical Cross Domain Solution, known as TACDS. It was the first ruggedized cross-domain solution designed and accredited for tactical and combat environments. TACDS is a low size, weight, power, and cost device. It suits ground vehicles, mobile shelters, ships, aircraft, and unmanned aerial vehicles. The platform needs no user interaction once configured for a mission. It remains an unclassified device until connected to a classified network. TACDS supports numerous tactical data and message formats, including full motion video. This gives warfighters real-time access to information across security domains in the field. General Dynamics does not publish a standard throughput figure, since TACDS configurations vary by platform and mission profile.
Garland Technology
Garland Technology is a US-based TAP specialist. It has built a hardware data diode product line alongside its wider packet broker and inline bypass portfolio. The company pairs this with an active operational technology security partner ecosystem, including Nozomi Networks, TXOne, Dispel, EmberOT, and Radiflow. Garland states a no hidden fees, no subscriptions commercial model. This appeals to defense buyers wary of recurring licensing costs on classified infrastructure. Verified maximum throughput across its broader TAP and packet broker range reaches 100 Gbps. Diode-only throughput figures are not separately published. Garland's field presence remains strongest in the United States. European coverage runs through distributor relationships rather than owned sales.
How To Choose The Right Data Diode For Your Defense Network
Selecting a data diode or cross-domain solution for a defense environment means balancing certification requirements against real throughput. Deployment constraints matter too. The criteria below reflect what actually drives defense procurement decisions.
Certification And Accreditation Pathway
Confirm which certification your program actually requires before you compare vendors. National Cross Domain Strategy and Management Office Baseline listing is typically mandatory for US Department of Defense programs. Raise the Bar compliance is often required too. Critical infrastructure operators and allied nations more often specify Common Criteria evaluation instead. Skipping this check first can eliminate half your shortlist before you even compare throughput.
Throughput Versus Actual Data Volume
Match a diode's rated throughput to your actual data volume, not your network's overall link speed. Most cross-domain traffic consists of logs, telemetry, and file transfers rather than full-rate production data. Oversizing wastes budget. Undersizing forces you to queue or drop data at the boundary.
Deployment Environment
Consider whether your deployment sits in a fixed data center, a forward operating base, or a moving platform. Aircraft and vehicles demand ruggedized, low size, weight, and power hardware. Fixed installations can prioritize higher throughput over compactness.
Key environmental factors include:
- Operating temperature range and vibration resistance for field deployments
- Rack space and power availability at the installation site
- Whether the deployment needs to be tamper-resistant or tamper-evident
Protocol Support And Integration
Check whether the diode requires unidirectional protocols such as UDP by default. Some diodes include proxy software to handle common bidirectional protocols instead. A pure hardware diode without protocol connectors can require significant integration work on both sides of the boundary. If your infrastructure already includes a network packet broker, check whether diode functionality can run on that same hardware.
Total Cost Of Ownership
Compare not just hardware cost but licensing model, support structure, and the number of separate appliances the architecture requires. A hybrid approach combining TAP, broker, and diode functionality in one chassis reduces the change management surface area. This matters most where resilience testing and security audits scrutinize architecture closely.
Vendor Track Record In Defense And Intelligence
Prioritize vendors with a documented history serving defense, intelligence, or coalition programs over general-purpose OT security vendors. Ask for specific accreditation evidence and reference deployments at a similar classification level to your own requirement.
Frequently Asked Questions
What Is A Data Diode?
A data diode is a hardware device that enforces one way data transfer between two networks. Unlike a firewall, which relies on software rules, a data diode makes reverse data flow physically impossible. Firewall rules can be misconfigured or exploited. A data diode has no such exposure.
What Is The Difference Between A Data Diode And A Cross-Domain Solution?
A data diode is the hardware primitive that enforces unidirectional transfer. A cross-domain solution combines that hardware, or a software-based guard, with protocol connectors and policy enforcement. It adds management tools for real mission use cases. Examples include file sharing or voice and video collaboration across classification boundaries.
Do Defense Programs Need National Cross Domain Strategy And Management Office Certification?
Most US Department of Defense and intelligence programs require National Cross Domain Strategy and Management Office Baseline listing. Raise the Bar compliance is often required too. Allied nations and critical infrastructure operators more commonly specify Common Criteria evaluation instead. Confirm your specific program requirement early in the procurement process.
Can Data Diode Functionality Run On Existing Network Infrastructure?
Yes, some vendors build data diode functionality into existing network taps and packet broker hardware. This avoids requiring a standalone appliance. It can shorten deployment time and reduce the number of devices a network team must manage. The underlying infrastructure is often already in place.
How Much Does A Defense-Grade Data Diode Cost?
Cost varies widely by throughput, certification level, and deployment model. A basic gigabit diode for a fixed installation costs far less than a Raise the Bar compliant tactical solution. A tactical unit rated for vehicle or aircraft deployment carries a much higher price. Mission-specific integration services add further cost on top of hardware.
Do I Need A Diode Or A Full Cross-Domain Solution For My Program?
A pure hardware diode suits simple one way data replication. An example is sending telemetry from a classified system to a monitoring platform. A full cross-domain solution suits missions needing file sharing or bidirectional transfer with human review. It also fits formats like full motion video across the boundary.
Build Your Defense Visibility Architecture With Network Critical
Choosing the right data diode approach affects both your security posture and your long-term operating cost. Network Critical's hybrid TAP and packet broker architecture folds diode-enforced segmentation into infrastructure you already deploy. This avoids a separate appliance and console for every boundary in your network. Perpetual hardware licensing keeps costs predictable. Drag n vu configuration typically brings deployment in under two hours, not a multi-day engagement. Explore the full range of hybrid TAP and packet broker solutions to see how unidirectional flow fits your architecture. Or speak to the Network Critical team to discuss your certification and throughput requirements.
