NIST NTP servers

Chuck Church chuckchurch at
Tue May 10 14:57:27 UTC 2016

True, but I did mention verifying packet sources.  That needs to happen everywhere, and it's not hard to do.  Just getting everyone to do it is tough.


-----Original Message-----
From: Allan Liska [mailto:allan at] 
Sent: Tuesday, May 10, 2016 10:40 AM
To: Chuck Church <chuckchurch at>; 'Majdi S. Abbas' <msa at>; nanog at
Subject: RE: NIST NTP servers

On 5/10/2016 at 10:30 AM, "Chuck Church" <chuckchurch at> wrote:

>It doesn't really.  Granted there are a lot of CVEs coming out for NTP 
>the last year or so.  But I just don't think there are that many 
>attacks on it.
>It's just not worth the effort.  Changing time on devices is more an 
>annoyance than anything, and doesn't necessarily get you into a device.
>Sure you can hide your tracks a little by altering time in logs and 
>altering it back, but that's more of an in-depth nation-state kind of 
>attack, not going to be a script kiddie kind of thing.  Just follow the 
>best practices for verifying packet sources and NTP security itself, 
>and you should be ok.

I would argue that the fact the NTP can, and has been, be used in DDoS amplification attacks is a serious concern for using protocol going forward.


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