[ntp:questions] UDP 123 Port restriction

Terje Mathisen "terje.mathisen at tmsw.no" at ntp.org
Thu Feb 10 14:23:43 UTC 2011


Chandan Laskar wrote:
>
> Hi,
>
> We are planing to deploy Network Time Server in our Organization.
>
> According to the architecture , Stratum 2 server will be responsible to
> provide correct time to Stratum 3 server and client ( Other servers) will
> synchronize with Stratum 3 server for obtaining correct time. Stratum 2
> server will synchronize with Stratum 1  server.
>
> We will use NTP 4.2.6p3
>
> Is it mandatory to open UDP port 123  between Stratum 2 and Stratum 3
> server also between Stratum 3 and Client Machine for time synchronization?
>
>
> Can we use any customized port instead of UDP 123 for time
> synchronization?

You _can_ change the port number, but only by patching and costum 
compiling your own version of the NTP source code.

I.e. the answer is effectly: "No, you cannot change: Port 123 is the 
time sync port!"

Terje

-- 
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"




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