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Client devices using SNTP not working with NTP server options

Chris Priestley

I have a sophos running UTM firmware 9.403-4. This is running as an NTP server for client devices. It's working for all devices except some spectralink 8440 wifi phones which use SNTP (not NTP) for time sync.

 

Is this supported on the Sophos end?

 

Are there any logs available to check for NTP requests being sent tot the sophos?



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  • 0 in reply to Alexander Busch

    HI All,

    there is a lot of good information here.

    In my experience with SIP devices, out of the box they do come with pre-programmed time servers (Yealink have Chinese time servers, which I have blocked with country blocking). Also there is a setting on Yealink phones that allows for priority to be given to either DHCP (options) time servers or the programmed time servers.

    Also seeing the top services does not mean that the rule is allowed, just that a device is trying to use that service.

    I have found many articles out there stating that they are the same just that SNTP does not use the more advanced algorithms that NTP uses, e.g. drift.

    please take a little time to read this page that I found;

    http://www.galsys.co.uk/news/sntp-vs-ntp/

    hope this helps

    XG & UTM Architect (Systems: XG v18 & UTM 9.7 - Virtual, HW & SW)
    Curious enough to take it apart, skilled enough to put it back together, Clever enough to hide the extra parts when I'm Done!

  • 0 in reply to BAlfson

    BAlfson said:

    What about the "Top servers by service: NTP' selection, Alex?

    Cheers - Bob

     

    Unfortunately, no, Bob. Strange that these reports works with other services (LDAP, DOMAIN). So maybe it's time to bother the support with that [*-)]

    Best
    Alex

    -

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