TP-Link TL ER5120 Review | 77 Data compared

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  • Avg. price in UK: ~£160
  • Avg. price in US: ~$140
  • Wi-Fi version: N/A
  • Wi-Fi speed: N/A Mbps
  • LAN port speeds: 1 Gbps
  • Wireless coverage: N/A

TP-Link TL ER5120 review. Compare 77 technical specifications and user reviews to see how it ranks among routers and if it is worth buying.

6.2

Overall score

What it is: An overall evaluation of the router's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best routers on the market.

Score components:

90.0%

6.2

Technical Score

10.0%

?

User score

Good
6.2

Technical Score

What it is: An assessment of the router's technical performance, covering key areas such as Wi-Fi performance, wired connectivity, security, software features, coverage, and design.

When it matters: When you want to compare routers based on technical performance and available features.

Score components:

26.0%

2.9

Wireless

20.0%

5.5

Ports

18.0%

10

Networking

14.0%

8.6

Security

12.0%

6.2

Hardware

10.0%

6.4

Management

Good
?

User score

What it is: A rating that combines user reviews and the total number of reviews received by the router.

When it matters: When you want to know how a router performs in daily use and how reliable it is for speed, coverage, and stability according to user feedback.

Score components:

70.0%

?

User reviews

30.0%

?

Popularity

  • 5.6
    Gaming

    Score components:

    33.0%

    0.0

    Wi-Fi speed

    28.0%

    9.7

    CPU clock speed

    22.0%

    5.4

    RAM capacity

    17.0%

    10

    Maximum connected devices

  • 1.3
    Travel

    Score components:

    40.0%

    1.0

    Weight

    30.0%

    0.0

    Wi-Fi speed

    20.0%

    4.0

    Cellular modem type

    10.0%

    1.0

    SIM slot

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Best prices in UK

    N/A~ £160

Best rankings

?

Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The TP-Link TL-ER5120 is a Gigabit Load Balance Broadband Router designed for small to medium enterprises, featuring a 64-bit dedicated processor and 2Gbit DDRIII high-speed memory for robust data processing. Its hardware configuration includes 1 fixed Gigabit WAN port, 1 fixed Gigabit LAN/DMZ port, and 3 adaptable Gigabit WAN/LAN ports, supporting up to 4 WAN connections for intelligent load balancing and link backup. Key pros include extensive security features such as DoS defense, ARP inspection, and 4kV lightning protection, alongside specialized management tools like a built-in PPPoE server and one-click IM/P2P application blocking. However, reported cons include potential CPU performance bottlenecks under heavy PPPoE routing loads and a lack of built-in wireless capabilities, requiring external access points for Wi-Fi.

Technical Specifications of router TP-Link TL ER5120

Technical Score

What it is: An assessment of the router's technical performance, covering key areas such as Wi-Fi performance, wired connectivity, security, software features, coverage, and design.

When it matters: When you want to compare routers based on technical performance and available features.

Score components:

26.0%

?

Wireless

20.0%

?

Ports

18.0%

?

Networking

14.0%

?

Security

12.0%

?

Hardware

10.0%

?

Management

6.2
TP-Link TL ER5120 has a technical score of 6.23 points, which is lower than that of 61.8% of products in this category.
User score

What it is: A rating that combines user reviews and the total number of reviews received by the router.

When it matters: When you want to know how a router performs in daily use and how reliable it is for speed, coverage, and stability according to user feedback.

Score components:

70.0%

0.0

User reviews

30.0%

1.0

Popularity

?
Popularity
What it is: An indicator based on the number of reviews received by the router.
When it matters: When you prefer to choose a router reviewed and selected by many other buyers.
1.0
TP-Link TL ER5120 has a popularity of 1 points, which is lower than 71.1% of products in this category.
Ratio quality/price

What it is: An indicator that combines the router's overall rating with its cost.

When it matters: When you are looking for a router with a good balance between network performance, features, and price.

Score components:

60.0%

6.2

Overall score

40.0%

9.7

Price

7.3
TP-Link TL ER5120 has a quality-to-price ratio of 7.3 points, which is lower than 65.2% of products in this category.
Brand name
What it is: The manufacturer or brand of the product.
When it matters: When you prefer a specific ecosystem, support network, or design philosophy.

Importance: MEDIUM

TP-Link
Wi-Fi version
What it is: Identifies the Wi-Fi generation the router supports, such as Wi-Fi 5, 6, 6E, or 7.
When it matters: When newer phones, laptops, and consoles need the latest Wi-Fi efficiency and speed features.

Importance: HIGH

Good value: Wi-Fi 6 (802.11ax)

N/A
Wi-Fi bands
What it is: Lists which wireless frequency bands the router can use, such as 2.4 GHz, 5 GHz, or 6 GHz.
When it matters: When you need to balance range, speed, and congestion across different types of client devices.

Importance: HIGH

Good value: 2.4 GHz + 5 GHz

N/A
Wi-Fi speed
What it is: The advertised maximum wireless throughput rating of the router under supported conditions.
When it matters: When several users stream, download, and game at once and you want more wireless headroom.

Importance: HIGH

Good value: >2700 Mbps

N/A
Channel widths supported
What it is: Lists the Wi-Fi channel widths the router can use, such as 20, 40, 80, or 160 MHz.
When it matters: When you want the option to trade peak speed against stability in crowded wireless environments.

Importance: MEDIUM

Good value: 20 MHz + 40 MHz + 80 MHz

N/A
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Wi-Fi security protocols
What it is: Lists the wireless security standards the router supports, such as WPA2 or WPA3.
When it matters: When you want stronger wireless protection without locking out older devices that still need compatibility.

Importance: HIGH

N/A
DoS protection
What it is: Provides defenses intended to reduce the impact of denial-of-service traffic against the router or network.
When it matters: When exposed services or remote access make resilience against traffic floods more important.

Importance: HIGH

yes
TP-Link TL ER5120 includes DoS protection. 11% of routers include DoS protection.
SPI intrusion protection
What it is: Uses stateful packet inspection to track sessions and block suspicious unsolicited traffic more accurately.
When it matters: When the router needs a stronger first line of filtering on an internet-facing connection.

Importance: HIGH

yes
TP-Link TL ER5120 includes SPI-based intrusion protection. 3.6% of routers include SPI-based intrusion protection.
MAC address filtering
What it is: Lets the router allow or block devices based on their MAC addresses.
When it matters: When you want an extra device-level access rule beyond passwords and network names.

Importance: MEDIUM

yes
TP-Link TL ER5120 supports MAC address filtering. 1% of routers include MAC address filtering.
URL filter
What it is: Allows the router to block or allow access based on website addresses or domain rules.
When it matters: When you need to restrict specific sites for children, guests, or work-policy reasons.

Importance: MEDIUM

yes
TP-Link TL ER5120 supports URL filtering. 1.8% of routers include URL filtering.
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IPv6 support
What it is: Support for the newer IPv6 internet addressing standard alongside the older IPv4 system.
When it matters: When your internet provider or network already uses IPv6, or you want the router to stay compatible as IPv6 use becomes more common.

Importance: HIGH

yes
TP-Link TL ER5120 supports IPv6. 10.9% of routers are IPv6-ready.
Dynamic routing
What it is: Supports routing protocols or dynamic route updates instead of relying only on static route entries.
When it matters: When the router sits in a more complex network with changing paths between multiple subnets.

Importance: MEDIUM

yes
TP-Link TL ER5120 supports dynamic routing. 46.8% of routers support dynamic routing.
Inter-VLAN routing
What it is: Allows the router to pass traffic between separate VLANs under controlled rules.
When it matters: When you need segmented networks to communicate selectively instead of staying fully isolated.

Importance: MEDIUM

yes
TP-Link TL ER5120 supports inter-VLAN routing. 78% of routers support inter-VLAN routing.
VLAN tagging
What it is: Lets the router mark traffic with VLAN tags for segmented or ISP-specific network setups.
When it matters: When you separate guest, office, IoT, or ISP-required traffic into different network segments.

Importance: MEDIUM

yes
TP-Link TL ER5120 supports VLAN tagging. 37.2% of routers include VLAN tagging.
QoS
What it is: Provides quality-of-service controls that prioritize some traffic over less important traffic.
When it matters: When calls, gaming, and downloads compete and you want latency-sensitive traffic protected.

Importance: HIGH

yes
TP-Link TL ER5120 includes QoS controls. 2.7% of routers include QoS controls.
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N. of LAN ports
What it is: Measures how many LAN ports the router includes. A higher count expands direct connectivity for matching devices.
When it matters: When you run a home office with NAS, TV boxes, and desktops, having more LAN ports avoids extra switches and keeps latency lower on wired links.

Importance: HIGH

Good value: 4 ports

4
TP-Link TL ER5120 has 4 LAN ports, which is more than 23.4% of routers and the same as 69.5% of routers.
LAN port speeds
What it is: Lists the Ethernet speeds available on the router’s LAN ports, such as Gigabit or multi-gig.
When it matters: When wired transfers to NAS, desktops, or access points need more than basic Ethernet speeds.

Importance: HIGH

Good value: 1 Gbps

1 Gbps
TP-Link TL ER5120 offers 1 Gbps on its LAN ports, which is faster than 27.2% of routers and on par with 59.8% of routers.
Includes LAN-capable combo ports.
N. of WAN ports
What it is: Shows how many separate WAN uplink ports the router provides for internet connections.
When it matters: When you use dual internet lines, backup WAN, or load balancing between multiple external links.

Importance: HIGH

Good value: 1 WAN port

4
TP-Link TL ER5120 has 4 WAN ports, which is more than 99.5% of routers and the same as 0.5% of routers.
N. of USB ports
What it is: Shows how many USB ports the router includes for storage, printers, or modem accessories.
When it matters: When you plan to share storage, attach a printer, or use USB-based network extras.

Importance: MEDIUM

Good value: 1 USB port

0
TP-Link TL ER5120 has 0 USB ports, which is fewer than 61.1% of routers and the same as 38.9% of routers.
Power over Ethernet (PoE)
What it is: Power over Ethernet support, meaning the router can receive power, deliver it, or be part of a PoE-based installation.
When it matters: When you want cleaner installation with fewer separate power cables, especially in ceilings, walls, racks, or remote locations.

Importance: MEDIUM

no
TP-Link TL ER5120 does not support Power over Ethernet (PoE). 0.5% of routers can be powered over Ethernet.
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Management interface
What it is: Shows how the router is configured and monitored, such as web UI, app, or command-line tools.
When it matters: When setup depth and day-to-day admin convenience are part of the buying decision.

Importance: HIGH

Web UI, CLI, SNMP
TP-Link TL ER5120 uses Web UI, CLI, SNMP for management, which is more advanced than 97.8% of routers and equal to 2% of routers.
Firmware upgrade method
What it is: Describes how router firmware updates are installed, such as automatic OTA, web UI, or manual upload.
When it matters: When you want security fixes and new features applied with less maintenance friction.

Importance: HIGH

Web UI
TP-Link TL ER5120 supports Web UI firmware update methods, which are less convenient than 69.5% of routers and equal to 29.7% of routers.
Traffic monitoring
What it is: Lets the router track bandwidth usage by device, app category, or time period.
When it matters: When you need to find which devices or activities are causing slowdowns or high data use.

Importance: MEDIUM

yes
TP-Link TL ER5120 includes traffic monitoring. 17.5% of routers include traffic monitoring.
Guest Wi-Fi network
What it is: Lets the router create a separate wireless network for visitors or less-trusted devices.
When it matters: When guests need internet access without reaching private devices on the main network.

Importance: HIGH

no
TP-Link TL ER5120 does not offer a guest Wi‑Fi network. 91.6% of routers offer a guest Wi‑Fi network.
Captive portal
What it is: Supports a login or acceptance page that users must pass before getting internet access.
When it matters: When guest networks, rentals, cafes, or managed access points need a sign-in page.

Importance: MEDIUM

yes
TP-Link TL ER5120 offers captive portal features. 76.4% of routers offer captive portal features.
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CPU clock speed
What it is: Shows the operating frequency of the router processor, often listed per core.
When it matters: When routing, encryption, QoS, and many active clients can put heavier load on the CPU.

Importance: HIGH

2 x 4 GHz
TP-Link TL ER5120 runs at 2x4 GHz, which is faster than 91.6% of routers.
RAM capacity
What it is: The amount of working memory available for sessions, routing tables, and running router services.
When it matters: When many devices, VPN tunnels, or advanced features need the router to stay responsive under load.

Importance: HIGH

Good value: >=512 MB

256 MB
TP-Link TL ER5120 has 256 MB of RAM, which is more than 50.4% of routers and the same as 15.2% of routers.
Internal storage
What it is: The built-in storage available for logs, apps, shared files, or other local router functions.
When it matters: When the router runs extra services and needs space for logs, packages, or shared content.

Importance: MEDIUM

Good value: >=8 GB

0.007812 GB
TP-Link TL ER5120 has 0.007812 GB of internal storage, which is less than 73.1% of routers and the same as 20.3% of routers.
Hardware acceleration
What it is: Uses dedicated hardware paths to offload routing, NAT, encryption, or switching tasks from the main CPU.
When it matters: When heavy routing or security features would otherwise reduce throughput on the processor alone.

Importance: HIGH

yes
TP-Link TL ER5120 offers hardware acceleration. 19.3% of routers offer hardware acceleration.
N. of external antennas
What it is: Shows how many antennas are mounted externally on the router.
When it matters: When you want stronger adjustable coverage or plan to aim antennas for difficult room layouts.

Importance: MEDIUM

Good value: 3 antennas

0
TP-Link TL ER5120 has 0 external antennas, which is fewer than 59.7% of routers and the same as 40.3% of routers.
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TP-Link TL ER5120 vs the average router

  • Supports automatic failover
    TP-Link TL ER5120 offers automatic failover, while the average router does not. 24.5% of routers offer automatic failover.
    What it is: Can switch to a backup internet connection automatically if the primary line fails.
    When it matters: When uptime matters and the network cannot stop every time the main WAN drops.

    Importance: MEDIUM

    TP-Link TL ER5120 offers automatic failover, while the average router does not. 24.5% of routers offer automatic failover.
  • 3 more WAN ports
    TP-Link TL ER5120 has more WAN ports than the average router (4 vs 1). The average router has 1 WAN ports.
    What it is: Shows how many separate WAN uplink ports the router provides for internet connections.
    When it matters: When you use dual internet lines, backup WAN, or load balancing between multiple external links.

    Importance: HIGH

    Good value: 1 WAN port

    TP-Link TL ER5120 has more WAN ports than the average router (4 vs 1). The average router has 1 WAN ports.4 vs 1
  • Higher CPU clock speed
    TP-Link TL ER5120 has a higher CPU clock speed than the average router (2x4 GHz vs 2x0.5 GHz). The average router has a CPU clock speed of 2x0.5 GHz.
    What it is: Shows the operating frequency of the router processor, often listed per core.
    When it matters: When routing, encryption, QoS, and many active clients can put heavier load on the CPU.

    Importance: HIGH

    TP-Link TL ER5120 has a higher CPU clock speed than the average router (2x4 GHz vs 2x0.5 GHz). The average router has a CPU clock speed of 2x0.5 GHz.2x4 GHz vs 2x0.5 GHz
  • Supports inter-VLAN routing
    TP-Link TL ER5120 supports inter-VLAN routing, while the average router does not. 22.2% of routers support inter-VLAN routing.
    What it is: Allows the router to pass traffic between separate VLANs under controlled rules.
    When it matters: When you need segmented networks to communicate selectively instead of staying fully isolated.

    Importance: MEDIUM

    TP-Link TL ER5120 supports inter-VLAN routing, while the average router does not. 22.2% of routers support inter-VLAN routing.
  • Better management tools
    TP-Link TL ER5120 uses the management interface Web UI, CLI, SNMP, while the average router uses Web UI, App.
    What it is: Shows how the router is configured and monitored, such as web UI, app, or command-line tools.
    When it matters: When setup depth and day-to-day admin convenience are part of the buying decision.

    Importance: HIGH

    TP-Link TL ER5120 uses the management interface Web UI, CLI, SNMP, while the average router uses Web UI, App.Web UI, CLI, SNMP vs Web UI, App
  • 145,904 more NAT sessions
    TP-Link TL ER5120 has more concurrent NAT sessions than the average router (150,000 vs 4,096). The average router supports 4,096 concurrent NAT sessions.
    What it is: The number of simultaneous NAT-tracked connections the router can handle before tables become a bottleneck.
    When it matters: When many apps and devices open lots of parallel internet sessions at the same time.

    Importance: MEDIUM

    Good value: >=16000 sessions

    TP-Link TL ER5120 has more concurrent NAT sessions than the average router (150,000 vs 4,096). The average router supports 4,096 concurrent NAT sessions.150,000 vs 4,096
  • Supports captive portal
    TP-Link TL ER5120 supports captive portal, while the average router does not. 23.8% of routers support captive portal.
    What it is: Supports a login or acceptance page that users must pass before getting internet access.
    When it matters: When guest networks, rentals, cafes, or managed access points need a sign-in page.

    Importance: MEDIUM

    TP-Link TL ER5120 supports captive portal, while the average router does not. 23.8% of routers support captive portal.
  • 236 more connected devices
    TP-Link TL ER5120 supports more connected devices than the average router (300 vs 64). The average router supports 64 connected devices.
    What it is: The vendor’s stated upper limit for how many client devices the router can support at once.
    When it matters: When the network must handle many phones, TVs, smart-home devices, and PCs together.

    Importance: MEDIUM

    Good value: >=128 devices

    TP-Link TL ER5120 supports more connected devices than the average router (300 vs 64). The average router supports 64 connected devices.300 vs 64
  • 236 more connected devices
    TP-Link TL ER5120 supports more connected devices than the average router (300 vs 64). The average router supports 64 connected devices.
  • Supports automatic failover
    TP-Link TL ER5120 offers automatic failover, while the average router does not. 24.5% of routers offer automatic failover.
  • Supports inter-VLAN routing
    TP-Link TL ER5120 supports inter-VLAN routing, while the average router does not. 22.2% of routers support inter-VLAN routing.
  • 145,904 more NAT sessions
    TP-Link TL ER5120 has more concurrent NAT sessions than the average router (150,000 vs 4,096). The average router supports 4,096 concurrent NAT sessions.
  • 3 more WAN ports
    TP-Link TL ER5120 has more WAN ports than the average router (4 vs 1). The average router has 1 WAN ports.
  • Better management tools
    TP-Link TL ER5120 uses the management interface Web UI, CLI, SNMP, while the average router uses Web UI, App.
  • Supports captive portal
    TP-Link TL ER5120 supports captive portal, while the average router does not. 23.8% of routers support captive portal.
  • Higher CPU clock speed
    TP-Link TL ER5120 has a higher CPU clock speed than the average router (2x4 GHz vs 2x0.5 GHz). The average router has a CPU clock speed of 2x0.5 GHz.
  • 2x GB more RAM
    TP-Link TL ER5120 has more RAM than the average router (256 MB vs 128 MB). The average router has 128 MB of RAM.
  • 1 fewer USB ports
    TP-Link TL ER5120 has fewer USB ports than the average router (0 vs 1). The average router has 1 USB ports.
  • Limited firmware updates
    TP-Link TL ER5120 supports the firmware update methods Web UI, while the average router supports Web UI, App, Automatic.
  • Less capable NAS services
    TP-Link TL ER5120 includes none NAS services, while the average router includes SMB, FTP, time machine, NFS, web access.
  • No guest Wi-Fi network
    TP-Link TL ER5120 does not offer a guest Wi-Fi network, while the average router does. 91.4% of routers offer a guest Wi-Fi network.
  • No DLNA support
    TP-Link TL ER5120 does not support DLNA, while the average router does. 54.5% of routers support DLNA.
  • 2 fewer external antennas
    TP-Link TL ER5120 has fewer external antennas than the average router (0 vs 2). The average router has 2 external antennas.
  • Limited firmware updates
    TP-Link TL ER5120 supports the firmware update methods Web UI, while the average router supports Web UI, App, Automatic.
    What it is: Describes how router firmware updates are installed, such as automatic OTA, web UI, or manual upload.
    When it matters: When you want security fixes and new features applied with less maintenance friction.

    Importance: HIGH

    TP-Link TL ER5120 supports the firmware update methods Web UI, while the average router supports Web UI, App, Automatic.Web UI vs Web UI, App, Automatic
  • Less capable NAS services
    TP-Link TL ER5120 includes none NAS services, while the average router includes SMB, FTP, time machine, NFS, web access.
    What it is: Lists the onboard file-sharing services the router can provide, such as SMB, FTP, or media sharing.
    When it matters: When the router is expected to handle light file serving without separate NAS hardware.

    Importance: MEDIUM

    TP-Link TL ER5120 includes none NAS services, while the average router includes SMB, FTP, time machine, NFS, web access.none vs SMB, FTP, time machine, NFS, web access
  • 1 fewer USB ports
    TP-Link TL ER5120 has fewer USB ports than the average router (0 vs 1). The average router has 1 USB ports.
    What it is: Shows how many USB ports the router includes for storage, printers, or modem accessories.
    When it matters: When you plan to share storage, attach a printer, or use USB-based network extras.

    Importance: MEDIUM

    Good value: 1 USB port

    TP-Link TL ER5120 has fewer USB ports than the average router (0 vs 1). The average router has 1 USB ports.0 vs 1
  • No guest Wi-Fi network
    TP-Link TL ER5120 does not offer a guest Wi-Fi network, while the average router does. 91.4% of routers offer a guest Wi-Fi network.
    What it is: Lets the router create a separate wireless network for visitors or less-trusted devices.
    When it matters: When guests need internet access without reaching private devices on the main network.

    Importance: HIGH

    TP-Link TL ER5120 does not offer a guest Wi-Fi network, while the average router does. 91.4% of routers offer a guest Wi-Fi network.
  • 5.84x less popular
    TP-Link TL ER5120 is less popular than the average router (1.00 vs 5.837).
    What it is: An indicator based on the number of reviews received by the router.
    When it matters: When you prefer to choose a router reviewed and selected by many other buyers.
    TP-Link TL ER5120 is less popular than the average router (1.00 vs 5.837).1 vs 5.84
  • 77.8% more expensive
    TP-Link TL ER5120 is more expensive than the average router (£160 vs £90).
    TP-Link TL ER5120 is more expensive than the average router (£160 vs £90).£160 vs £90
  • No DLNA support
    TP-Link TL ER5120 does not support DLNA, while the average router does. 54.5% of routers support DLNA.
    What it is: Supports DLNA-related media sharing or discovery for compatible devices on the local network.
    When it matters: When TVs, media players, and local content need easier plug-and-play discovery on the network.

    Importance: LOW

    TP-Link TL ER5120 does not support DLNA, while the average router does. 54.5% of routers support DLNA.
  • 2 fewer external antennas
    TP-Link TL ER5120 has fewer external antennas than the average router (0 vs 2). The average router has 2 external antennas.
    What it is: Shows how many antennas are mounted externally on the router.
    When it matters: When you want stronger adjustable coverage or plan to aim antennas for difficult room layouts.

    Importance: MEDIUM

    Good value: 3 antennas

    TP-Link TL ER5120 has fewer external antennas than the average router (0 vs 2). The average router has 2 external antennas.0 vs 2

Graphic comparison of TP-Link TL ER5120 and other routers

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Third-party reviews

What customers like about TP-Link TL ER5120?

  • Effective multi-WAN load balancing that supports up to 4 WAN ports simultaneously
  • Excellent value for the price, often cited as having more features than higher-end competitors at a lower cost
  • Robust and heavy-duty metal construction suitable for industrial or business environments
  • Reliable performance and high uptime once configured, with minimal speed drop-offs
  • Intuitive web interface that is relatively easy to set up for those with basic networking knowledge
  • Includes professional-standard lightning protection and built-in security features like DoS defense

What customers dislike about TP-Link TL ER5120?

  • Lacks built-in wireless (Wi-Fi) and modems, requiring separate devices for those functions
  • Early firmware versions (v1.00) were reported as flakey and buggy
  • Large physical footprint that requires significant shelf or rack space compared to consumer routers
  • Not ideal for gaming; users have reported difficulties obtaining an 'open' NAT on consoles
  • Failover switchover time is not instantaneous, often taking 5-10 seconds to redirect traffic
  • Documentation can be sparse, making advanced configurations more time-consuming

Video reviews

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