Top 8 Bypass TAPs for Zero Downtime Network Monitoring in 2026

Inline security tools – firewalls, Intrusion Prevention Systems (IPS), Web Application Firewalls (WAF) – are essential to modern network defense. But any device sitting directly in the path of live traffic creates risk: if it reboots for a patch, fails during a traffic spike, or goes offline for maintenance, the link drops. A bypass Test Access Point (TAP) eliminates that exposure. It monitors the health of the inline appliance and automatically reroutes traffic around it the moment a failure is detected – keeping your network live and your security stack intact.

Choosing the wrong bypass TAP means choosing between uptime and security every time you need to service a tool. This guide compares eight verified vendors delivering bypass TAP solutions in 2026, covering verified product specifications, key differentiators, and the use cases where each platform performs best.

Bypass TAP Vendors at a Glance

Vendor	Key Strength	Max Speed Supported
Network Critical	Modular hybrid TAP/broker with integrated bypass and Drag-n-Vu™ GUI	Up to 400G
Gigamon	Embedded bypass combo modules in the GigaVUE HC Series platform	Up to 100G
Keysight Technologies	iBypass family with pre-configured heartbeats and active-active HA	Up to 100G
Garland Technology	EdgeSafe inline bypass with sub-microsecond failover	Up to 100G
Niagara Networks	Carrier-grade 3808E hybrid bypass with inline service chaining	Up to 400G
Cubro Network Visibility	Self-generating heartbeat bypass with modular Packetmaster integration	Up to 100G
APCON	IntellaView chassis-based bypass blade with six simultaneous bypass taps	Up to 100G
Profitap	Portable IOTA inline bypass for field and edge deployments	Up to 10G

1. Network Critical – SmartNA & SmartNA-XL

Network Critical delivers bypass TAP solutions as an integrated capability within its modular SmartNA chassis family. Rather than treating bypass as a standalone function, Network Critical combines bypass switching, passive fiber TAP access, and network packet broker functionality in a single 1RU chassis – reducing the number of physical devices in your inline security architecture and cutting rack space, power draw, and cabling complexity.

The SmartNA-XL supports 1G, 10G, and 40G environments and accepts hot-swappable bypass TAP modules across five modular slots. Copper bypass modules include fail-to-wire protection, maintaining the network link even under complete power loss. Fiber bypass modules deliver active bypass protection at 1G and 10G, with 10G and higher variants also available. The SmartNA-PortPlus extends coverage to 100G environments, while the SmartNA-PortPlus HyperCore handles 400G deployments with 32 QSFP-DD interfaces.

All platforms run Drag-n-Vu™, Network Critical's patented graphical management interface. Its Auto Rule Generator and eZ Agg tools simplify bypass configuration without requiring detailed knowledge of filter rule hierarchies. An open API enables automated bypass control for environments integrating security tools directly with the visibility layer – as demonstrated in the verified Darktrace deployment below.

Proven results:

Vodafone: Achieved 100% accurate traffic visibility on key links while reducing customer churn rates across a multi-generation European mobile network
BP: Enabled centralized monitoring of critical Operational Technology (OT) and IT systems across refinery buildings with zero impact on live production traffic
Darktrace: Integrated SmartNA-PortPlus API with Darktrace machine learning to enable automated, real-time bypass control and traffic filtering without human intervention

2. Gigamon – GigaVUE HC Series Inline Bypass

Gigamon delivers inline bypass as an embedded capability within its GigaVUE HC Series platform. Bypass combo modules install directly into GigaVUE HC1, HC2, and HC3 chassis, providing both logical and physical bypass protection without requiring a separate external device. Physical bypass engages automatically at the hardware level when the node loses power – traffic passes through the link without software intervention. Logical bypass handles tool failure or maintenance scenarios, detecting failure through link-down events or loss of heartbeat before rerouting traffic.

The GigaVUE HC1 Plus delivers up to 1.8 Tbps of throughput at speeds from 1G to 100G. The HC3 supports 100G bypass combo modules including SR4 and LR variants. GigaVUE-OS provides inline service chaining, allowing multiple security tools to inspect traffic sequentially on a single protected path. Integration with the GigaVUE-FM fabric manager provides centralized bypass visibility and management across clustered nodes.

3. Keysight Technologies – iBypass Family

Keysight Technologies offers a purpose-built family of external bypass switches under the iBypass brand, covering deployments from 1G copper to 100G fiber. The iBypass HD (IBP-8000) is a modular chassis supporting up to eight 1G bypass switches in 1U, with hot-pluggable dual bypass modules and fail-to-wire protection on each segment. The iBypass DUO adds dual management interfaces and dual power fail options for environments requiring additional resilience.

A key differentiator is Keysight's support for active-active High Availability (HA) configurations – allowing multiple inline tools to inspect traffic simultaneously rather than sitting in standby. Pre-configured heartbeats for multi-vendor security tools reduce setup time and eliminate configuration errors during deployment. Traffic passes through inline links entirely in hardware, removing software as a failure point. The Fabric Controller centralized manager supports configuration and monitoring of tens to hundreds of iBypass devices from a single interface – a meaningful advantage for large-scale deployments.

4. Garland Technology – EdgeSafe Inline Bypass TAP

Garland Technology is a pure-play network visibility specialist with an exclusive focus on TAPs, packet brokers, and bypass switching. Its EdgeSafe series provides inline bypass protection for 1G to 100G links, with sub-microsecond failover to ensure security tools never create a single point of failure on critical paths.

The EdgeSafe is a portable, self-contained bypass solution deployable independently of a wider visibility infrastructure – useful for teams adding inline protection incrementally. The EdgeLens Focus takes this further, combining bypass TAP functionality with packet broker capabilities in a compact 1/2U to 1U half-rack form factor. Garland's Mira Encrypted Traffic Orchestration (ETO) platform integrates with bypass solutions to provide Transport Layer Security (TLS) decryption without adding a separate inline appliance. Garland also offers TAA-compliant bypass options for US government and regulated enterprise deployments.

5. Niagara Networks – 3808E Hybrid Bypass Switch

Niagara Networks delivers carrier-grade inline bypass through its Open Visibility Platform, with the 3808E as its flagship hybrid bypass switch for high-capacity environments. The 3808E combines active TAP functionality, bypass switching, and packet broker capabilities in a single platform – designed for data center core and aggregation layers where inline security inspection must coexist with high availability requirements.

The platform supports speeds up to 400G across copper, multimode fiber, and single-mode fiber. Failover is deterministic at the physical layer, meeting telco-grade sub-50ms requirements in standard configurations. Niagara supports symmetric steering so both directions of a flow traverse the same inline device – critical for stateful inspection tools like firewalls and IPS systems. Inline service chaining allows sequential tool deployment (e.g., firewall → IPS → TLS inspection → DLP) as a single protected segment. A passive bypass path ensures traffic continues even if the Niagara device itself fails.

6. Cubro Network Visibility – EX400 Bypass Switch

Cubro Network Visibility offers a range of bypass switches supporting network speeds from 10 Mbps to 100G. The EX400 is its advanced 40G and 100G bypass solution, built on Network Packet Broker (NPB) technology for environments requiring high-speed inline protection at an accessible price point.

A distinctive feature of Cubro's approach is self-generating heartbeat packets: the bypass device generates and detects heartbeats independently without requiring a management port or driver, which simplifies deployment and reduces failure modes. Cubro Bypass switches detect power outages, hardware failures, and network disruptions and can switch to a bypass path in less than one millisecond. The Universal Optical Bypass TAP operates standalone or in combination with a Cubro Packetmaster, enabling bypass protection across multiple links connected to a single sensitive device such as a firewall – a modular approach that reduces cost without compromising coverage.

7. APCON – IntellaView Bypass TAP Blade

APCON delivers bypass TAP functionality through the IntellaView Bypass TAP Blade – a chassis-based module that installs directly into its IntellaView modular visibility platform. Each blade provides six simultaneous bypass taps, diverting 100G traffic around offline security tools to protect both the network link and monitoring continuity.

The chassis-based design integrates bypass protection with APCON's broader packet brokering capabilities, including real-time processing of 100G network traffic, automatic detection of over 1,600 applications and 400 protocols, and 400G QSFP-DD connections. Teams already deploying APCON's IntellaView platform can add bypass protection as an incremental blade rather than introducing a separate device. This simplifies management and maintains a unified visibility architecture across both inline and out-of-band monitoring scenarios.

8. Profitap – IOTA Inline Bypass

Profitap specializes in portable, compact network visibility solutions with a strong focus on field deployments and troubleshooting use cases. The IOTA inline bypass solution combines TAP access and bypass functionality in a compact form factor suited to edge environments, branch offices, and industrial sites where rack-mounted hardware is impractical.

Profitap TAPs and inline bypass solutions support hardware timestamping with 8ns resolution – meaningful for environments where precise timing is required for forensic or performance analysis. The ProfiShark series provides USB-C and Thunderbolt connectivity for rapid temporary deployment. Profitap's portfolio also includes support for industrial protocols and Plastic Optical Fiber (POF), making it one of the few vendors addressing legacy physical media found in automotive and industrial Ethernet segments.

How to Choose the Right Bypass TAP for Your Network

Match Bypass Speed to Your Link Rate

A bypass TAP must operate at or above the line rate of the link it protects. Under-specified hardware introduces packet loss – or worse, triggers false failover events. Confirm whether your current infrastructure runs at 1G, 10G, 40G, or 100G per link, and plan one generation ahead. If you're operating at 100G today and a 400G upgrade is on your roadmap, consider platforms like Network Critical's SmartNA-PortPlus HyperCore or Niagara Networks' 3808E that support 400G today.

Assess Failover Speed Requirements

Not all bypass TAPs fail over at the same speed. Telco and financial services environments typically require sub-50ms failover to avoid session drops. Industrial environments may tolerate slightly longer recovery windows. Most enterprise-grade bypass TAPs in this list meet sub-millisecond to sub-50ms failover under standard configurations – confirm the specific threshold with the vendor for your deployment scenario.

Decide Between External Bypass and Embedded Bypass

External bypass switches (Keysight iBypass, Garland EdgeSafe, Cubro EX400) sit outside the main visibility platform and protect inline tools independently. Embedded bypass (Gigamon GigaVUE HC Series, APCON IntellaView) integrates bypass modules directly into a chassis that also handles packet brokering. External bypass provides flexibility for multi-vendor environments. Embedded bypass reduces device count and simplifies management when you're already committed to a single platform. Network Critical's modular hybrid TAP and packet broker approach offers a middle path – combining bypass, TAP, and brokering in one chassis without platform lock-in.

Determine Whether You Need Active-Active or Active-Standby HA

If your security policy requires continuous inspection – not just fail-open traffic flow – you need a bypass TAP that supports active-active high availability. This keeps two security tools inspecting traffic simultaneously rather than one tool sitting idle in standby. Keysight is notable for supporting active-active HA across its iBypass range. Most vendors support active-standby as a minimum.

Consider Inline Service Chaining

If your security architecture sequences multiple inline tools – for example, a firewall, then an IPS, then a TLS inspection engine – your bypass TAP needs to manage that chain as a single protected segment. A failure in any link should trigger coordinated bypass, not a partial failure that leaves some tools inline and others bypassed. Gigamon's GigaVUE-OS, Niagara Networks, and Network Critical's SmartNA platform each support inline service chaining.

Evaluate Management and Automation Capabilities

Bypass TAPs deployed at scale require centralized management. Configuring dozens of standalone devices individually introduces errors and slows incident response. Look for vendors offering:

Centralized management across multiple devices (Keysight Fabric Controller, Gigamon GigaVUE-FM, Drag-n-Vu™)
Open API support for automated bypass control from security tools
SNMP v2/v3 integration with existing network management platforms
Role-based access controls for enterprise security governance

Frequently Asked Questions

What Is a Bypass TAP?

A bypass TAP is a hardware device that sits inline between two network segments and protects inline security appliances – such as IPS, WAF, and firewall devices – from becoming single points of failure. It continuously monitors the health of the connected inline tool using heartbeat packets. If the tool fails, powers down, or is taken offline for maintenance, the bypass TAP automatically reroutes traffic around it so the network link stays up. Unlike passive network TAPs, bypass TAPs are active inline devices designed specifically to maintain uptime during security tool failure or maintenance.

What Is the Difference Between a Bypass TAP and a Passive TAP?

A passive TAP creates a copy of traffic from a live link and sends it to monitoring tools without touching the production path – it has no power requirements on the optical path and cannot impact network continuity. A bypass TAP sits inline in the production path and actively manages traffic flow around inline security appliances. Both are essential in a complete visibility architecture: passive TAPs for out-of-band monitoring, and bypass TAPs for protecting inline security tools. Many deployments combine both, with passive TAPs feeding packet brokers and bypass TAPs safeguarding IPS and firewall deployments on the same infrastructure.

What Happens to Traffic if the Bypass TAP Itself Fails?

Most enterprise-grade bypass TAPs include fail-to-wire or fail-open protection at the hardware level. If the bypass device loses power or suffers a hardware fault, physical relays close to connect the two network ports directly – maintaining the link without any active intervention. Passive optical TAPs are inherently fail-safe due to the physics of optical splitting. For bypass TAPs, confirm that your chosen device uses hardware-based failover rather than software-triggered failover, as software-based mechanisms introduce a dependency on the device remaining partially functional.

Do I Need a Bypass TAP If I Already Have a Packet Broker?

A packet broker aggregates, filters, and distributes traffic to monitoring tools – it doesn't protect the production link from inline tool failures. If your security tools sit out-of-band (receiving traffic copies from TAPs or Switch Port Analyzer (SPAN) ports), a bypass TAP isn't required. If any security tool sits inline – meaning live traffic passes through it – a bypass TAP is essential to prevent that tool from becoming a network outage risk. Many organizations use both: bypass TAPs to protect inline tools, and packet brokers to manage traffic distribution to out-of-band monitoring tools.

What Speeds Do Bypass TAPs Support?

Bypass TAPs are available across the full range of enterprise network speeds, from 1G copper to 400G fiber. Most enterprise deployments operate at 10G to 100G per link. For 400G environments – common in hyperscale data centers and AI infrastructure – verify that the vendor explicitly supports 400G bypass, not just 400G passive TAP access. Vendors including Network Critical and Niagara Networks have verified 400G bypass support in their current product lines.

How Do Heartbeat Packets Work in Bypass TAPs?

Bypass TAPs send regular test packets – called heartbeats – through the inline security appliance. The appliance is expected to return each heartbeat within a defined interval. If the bypass TAP doesn't receive a response, it treats the tool as failed and triggers bypass. Heartbeat frequency and timeout thresholds are configurable. Keysight's iBypass pre-configures heartbeats for multi-vendor security tools to reduce setup complexity and avoid compatibility issues during deployment.

Build Zero Downtime Into Your Security Architecture With Network Critical

Inline security tools only improve your security posture if they stay online. A bypass TAP is the hardware layer that makes that possible – ensuring that scheduled maintenance, unexpected failures, and software updates never translate into network outages.

Network Critical's bypass TAP solutions combine fail-safe bypass switching with the full packet brokering capabilities of the SmartNA platform in a single modular chassis. You get inline protection, out-of-band visibility, aggregation, and filtering – without deploying separate devices for each function. Verified deployments at organizations including Vodafone, BP, and Darktrace confirm that Network Critical's architecture performs in production environments where downtime is not an option.

Speak to the Network Critical team to discuss your inline security architecture, or request a free network audit to identify bypass TAP opportunities across your current environment.