Recent NTP pool traffic increase

Justin Paine justin at cloudflare.com
Mon Dec 19 21:19:40 UTC 2016


the new Mario app perhaps? :)

____________
Justin Paine
Head of Trust & Safety
Cloudflare Inc.
PGP: BBAA 6BCE 3305 7FD6 6452 7115 57B6 0114 DE0B 314D


On Mon, Dec 19, 2016 at 1:12 PM, David <opendak at shaw.ca> wrote:
> On 2016-12-19 1:55 PM, Jan Tore Morken wrote:
>>
>> On Mon, Dec 19, 2016 at 01:32:50PM -0700, David wrote:
>>>
>>> I found devices doing lookups for all of these at the same time
>>>
>>> {0,0.uk,0.us,asia,europe,north-america,south-america,oceania,africa,europe}.pool.ntp.org
>>> and then it proceeds to use everything returned, which explains why
>>> everyone is seeing an increase.
>>
>>
>> Thanks, David. That perfectly matches the list of servers used by
>> older versions of the ios-ntp library[1][2], which would point toward
>> some iPhone app being the source of the traffic.
>>
>> [1]
>> https://github.com/jbenet/ios-ntp/blob/d5eade6a99041094f12f0c976dd4aaeed37e0564/ios-ntp-rez/ntp.hosts
>> [2]
>> https://github.com/jbenet/ios-ntp/blob/5cc3b6e437a6422dcee9dec9da5183e283eff9f2/ios-ntp-lib/NetworkClock.m#L122
>>
>
> That would make sense - I see a lot of iCloud related lookups from these
> hosts as well.
>
> Also, app.snapchat.com generally seems to follow just after the NTP pool DNS
> lookups. I don't have an iPhone to test that though.
>
> Thanks,
>


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