Periodic traffic from Apple TV to Apple time servers every 2 seconds

Discussion in 'Apple TV and Home Theater' started by cinergi, May 31, 2016.

  1. cinergi macrumors newbie

    Joined:
    Jan 2, 2012
    #1
    Hello,

    My Apple TV 4 sends NTP requests to an Apple time server every 2 seconds. Here is a sample tcpdump output:

    15:05:51.244459 IP <local Apple TV IP>.ntp > usnyc3-ntp-001.aaplimg.com.ntp: NTPv4, Client, length 48
    15:05:53.247784 IP <local Apple TV IP>.ntp > usnyc3-ntp-001.aaplimg.com.ntp: NTPv4, Client, length 48
    15:05:55.253560 IP <local Apple TV IP>.ntp > uschi5-ntp-002.aaplimg.com.ntp: NTPv4, Client, length 48
    15:05:57.258931 IP <local Apple TV IP>.ntp > uschi5-ntp-002.aaplimg.com.ntp: NTPv4, Client, length 48
    15:05:59.260445 IP <local Apple TV IP>.ntp > uschi5-ntp-002.aaplimg.com.ntp: NTPv4, Client, length 48
    15:06:01.265923 IP <local Apple TV IP>.ntp > uschi5-ntp-002.aaplimg.com.ntp: NTPv4, Client, length 48
    15:06:03.267810 IP <local Apple TV IP>.ntp > uschi5-ntp-002.aaplimg.com.ntp: NTPv4, Client, length 48
    Oddly enough, there is no reply from the time server. Is this normal? It seems excessive to check the time server so often.

    -cinergi
     
  2. benjitek macrumors 6502a

    benjitek

    Joined:
    Sep 23, 2012
  3. Rigby macrumors 601

    Joined:
    Aug 5, 2008
    Location:
    San Jose, CA
    #3
    Looks like it's retrying because it doesn't receive a reply. Perhaps Apple's NTP server is temporarily unreachable.
     
  4. cinergi thread starter macrumors newbie

    Joined:
    Jan 2, 2012
    #4
    The NTP servers are reachable via ping (I tried); they just don't seem to be responding to the NTP requests.

    There is nothing special about my specific Apple TV 4, so I wonder whether they all exhibit this behavior, which would place a large strain on Apple's time servers! And for no discernible purpose, since there is no reply from the servers. I find it very strange.

    -cinergi
     

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