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LAN-Safe Firewall, Standalone

Surf with security! Automatically disconnect your LAN while using a modem.


Please call 877-877-2269 for a replacement product or part.
Extended Double Diamond™ Warranty Available (3 Additional Year)

Product Features

  • Breaks the connection to your 10BASE-T LAN while a modem is in use. Security breaches are eliminated!
  • Keeps hackers from dialing in.
  • Provides firewall protection to areas that don’t have it, and it applies extra protection to existing firewalls.
  • Powered from the telco line—use it anywhere!
  • Easy to install, no software needed.


  • The standard models (MC170A–MC171A) automatically re-establish the LAN connection when the modem call is completed.
  • The enhanced model (MC172A) requires you to run a virus scan or other analysis before the network is restored.
  • The enhanced model also comes with a password protection setup program.
  • A switch on the enhanced model enables it to operate in enhanced mode or in standard mode.
  • Because it‘s connected at the wall, the wallplate (MC171A) model makes it more difficult for users to bypass the system. The model features 110 connectors on the rear.

    Your modem is like a doorway to the outside world. But when a network modem is in use, you might as well invite every cybercreep out there to step inside and hack into your LAN.

    Sound risky? It is. But with the BLACK BOX® LAN-Safe Firewall, the bad guys will find the door to your network slammed shut.

    The LAN-Safe Firewall is an external hardware security device designed for PCs or servers that have both Ethernet NIC cards and modems. The LAN-Safe eliminates the risk of a hacker using an inbound or outbound modem connection to gain access to your corporate LAN.

    Although you can use the LAN-Safe at various points on the LAN, it’s primarily for smaller network environments without conventional firewalls and where one or more users access the Internet while their PC is connected to the LAN.

    With the LAN-Safe installed, the LAN connection is physically broken while the modem session is in progress—and your network is effectively safeguarded from LAN damage or security breaches via unguarded Internet connections. Once the modem call is completed, the LAN-Safe automatically restores the link to the LAN.

    You can use the LAN-Safe Firewall in other installations—even those with conventional firewalls that restrict access to high-priority servers while dialup modems are in use. It doesn’t matter whether the server supports the modem connection or if it’s an adjacent server—the LAN-Safe Firewall provides the extra protection your network needs.

    Installation is easy—no training or maintenance is required. Plus the LAN-Safe is powered from the telco line, so you can use it practically anywhere. Choose from standalone or wallplate versions. Our enhanced standalone model enables you to complete a virus scan or another, more specific analysis or audit-type program before re-establishing the LAN connection.

  • Tech Specs

    Connectors MC170A, MC172A: Modem: (2) RJ-11; NIC: (2) RJ-45; MC171A: Modem: (1) RJ-11; NIC: (1) RJ-45
    Indicators (1) Modem
    Size 3"H x 1.7"W x 0.8"D (7.6 x 4.3 x 2 cm)
    Weight 0.5 lb. (0.2 kg)
    These products work with:
    • CAT5e 100-MHz Patch Cable with Basic Connector (EVNSL05E)
    • RJ-11 (4-Wire) Modular Cable, Cross-Pinning (EL04M)
    Questions? Contact our FREE Tech Support.

    * Technical specification weight is the unit weight. It is not the packaged shipping weight. For shipping weight, please contact Black Box customer service at 877-877-2269.


    Double Diamond Warranty

    Extended 1 Year Warranty Available

    Protect your purchase with an additional 1 Year Double Diamond™ warranty!
    Cost: $9.80

    Extended 3 Year Warranty Available

    Protect your purchase with an additional 3 Year Double Diamond™ warranty!
    Cost: $19.59


    Double Diamond™ Warranty (Standard)

    Take the risk out of equipment purchases with the Double Diamond™ Warranty from Black Box Network Services.

    The Double Diamond Warranty is our warranty that protects your Black Box® brand products* from accidental damage, including drops, water, and power surges.

    The LAN-Safe Firewall, Standalone comes with a standard 2 Year Double Diamond™ Warranty (Standard) already included.

    During the warranty period, Black Box Network Services will repair or replace your damaged equipment within one week of receipt at NO CHARGE!*

    Plus, get an Extended Double Diamond Warranty.

    You can also extend your warranty or protect a previously purchased Black Box® brand product** for an additional year—for only 10% of the purchase price! Or, extend your coverage for a full three years for only 20% of the purchase price!

    Ordering an extended warranty is easy: When viewing a product in your shopping cart, just select the one or three years of additional coverage in the dropdown menu under “Warranty Options.” For details, contact Customer Service at 724-746-5500.

    * Warranty subject to certain exclusions and limitations ** Certain products may not be eligible.

    What’s more, we also have a 45-day return policy. Simply call Customer Service for a Return Authorization (RA) number, return your product in new condition and in the original package, and receive a full refund.