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Majid Azimi
Asked: 2012-12-31 21:21:31 +0800 CST

Using meinberg ntp over 40Km wireless network

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We have a network of 10 clients running Windows XP with meinberg ntp. Clients are syncing with two ntp servers over a 40Km wireless network using mikrotik devices. Some of clients are connecting to ntp servers over a hop to hop links. ntp servers are syncing with the Internet. The problem is ntp clients are become out of sync after two or three days. After I restart service everything is OK. I should do this procedure every two days. I want to know is this because of long way wireless link? My ntp conf files are simple:

server 192.168.1.2 iburst
server 192.168.1.3 iburst

Windows time service and firewall is disabled. Is there any solution? Am I missing any configuration option?

windows

2 Answers

  1. Best Answer

    It is not "the wlan link" as "there is nothing in a wlan link that particularly blocks ntp".

    It is possible that your link is unstable beyond what the NTP Clients can deal with, but that - would IMHO Show in other Areas, too. If you consider the WLAN link to be bad, then I would suggeset using the mikrotik traffic Generator functionality to get a better idea how much packet loss you have - time for a in depth Analysis.

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  2. If I get it correct you are using the meinberg windows ntp program. What could help is:

    server 192.168.1.2 iburst maxpoll 6
server 192.168.1.3 iburst maxpoll 6

    The maxpoll adjustment will limit the interval between ntp requests to 64 seconds (2^6, hence the 6).

    My guess is your wlan packet loss may vary during the day (RF is always magic) and this may confuse ntpd.

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