Recent NTP pool traffic increase
dan-nanog at drown.org
Mon Dec 19 21:49:11 UTC 2016
Quoting David <opendak at shaw.ca>:
> 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
>>> 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, which would point toward
>> some iPhone app being the source of the traffic.
> 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.
Confirmed - starting up the iOS Snapchat app does a lookup to the
domains you listed, and then sends NTP to every unique IP. Around
35-60 different IPs.
Anyone have a contact at Snapchat?
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