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Sp33drasr's avatar
Sp33drasr
Aspirant
Nov 04, 2022
Solved

Block ioT access to internet but, allow NTP time synchronization

I have some home security cameras (Reolink, Amcrest and Foscam). I'd like to block them from having general access to the internet while still allowing them to auto-update their time settings from an NTP server. Anyone know how to do that?

  • Orbi routers have a feature called Block Services (on the Advanced Tab, Security Menu).

    Network Time Protocol (NTP) uses UDP port 123.  Three rules would block a camera from everything else:

    1. Block TCP ports 1-65535
    2. Block UDP ports 1-122
    3. Block UDP ports 124-65535

    It would be really convenient if all of the cameras have consecutive IP addresses.

     

1 Reply

  • Orbi routers have a feature called Block Services (on the Advanced Tab, Security Menu).

    Network Time Protocol (NTP) uses UDP port 123.  Three rules would block a camera from everything else:

    1. Block TCP ports 1-65535
    2. Block UDP ports 1-122
    3. Block UDP ports 124-65535

    It would be really convenient if all of the cameras have consecutive IP addresses.