![]() Head to Firewall -> NAT -> Port Forward -> Add In the example below, we will be hijacking the requests using a pfSense router. Router - The better solution would be to catch all requests on port 123 (NTP) and redirect them to your NTP server. Hijacking the NTP requests can be done in two different ways.ĭNS - If you have Adguard Home or a pi-Hole running you can set DNS records for the popular time servers to the Local IP address of your NTP server. Start the container with: sudo docker-compose up -d Hijacking outgoing NTP requests You can use the example below which uses a range of Stratum 1 servers and a pre-build docker image. This is a Stratum 3 NTP server (making your's a Stratum 4). ![]() The example docker-compose provided in the docs synchronise with. In this tutorial, we will be deploying an NTP server using a Docker Image of chrony.Ĭhrony is a lightweight NTP server that has been designed for unstable environments such as a Virtual Machine or Docker container. You can query an NTP server using the following command on Linux: Stratum 3 servers synchronise with stratum 2 server, this goes on to stratum 15. Stratum 0 devices are connected directly to a Stratum 1 server which then operates the NTP server.Ī Stratum 2 server typically queries multiple different Stratum 1 servers to synchronise with the time, this improves stability. NTP Servers operate in a hierarchical structure.Ī Stratum 0 server is a high-precision timekeeping device, typically this is a GPS receiver however it could be an Atomic Clock. Let's wait to see the havoc this will cause! Year 2038 Problem Wikipedia ![]() As NTP uses Epoch time (Starting 1 January 1900) the first rollover occurs in 2036. This means NTP has an overflow issue where it rolls over every 136 years. The protocol works by sending timestamps with each request, an algorithm is then used to calculate the time whilst minimising the effect of network latency.įun fact: NTP uses a 64-bit timestamp consisting of a 32-bit part part for seconds and a 32-bit part for fractions of a second. NTP or Network Time Protocol is a networking protocol to allow for computers to synchronise their times over the internet. What we can do is set up a local NTP server, to reduce all of these outgoing requests. When looking through my DNS logs there's is a query going off to / / *. on average every minute. Typically they will query from every 5 mins to a few hours. ![]() Why on earth would you want a local time server?Īlmost all the devices on your network will be contacting an NTP (Network Time Protocol) server to ensure they have the correct time. Disclaimer: This is massively overkill and you will look like a NERD!
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