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

cinergi

macrumors member
Original poster
Jan 2, 2012
54
12
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
 

Rigby

macrumors 603
Aug 5, 2008
5,307
6,409
San Jose, CA
Oddly enough, there is no reply from the time server. Is this normal? It seems excessive to check the time server so often.
Looks like it's retrying because it doesn't receive a reply. Perhaps Apple's NTP server is temporarily unreachable.
 

cinergi

macrumors member
Original poster
Jan 2, 2012
54
12
Looks like it's retrying because it doesn't receive a reply. Perhaps Apple's NTP server is temporarily unreachable.
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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