All three devices also run an SSL-VPN, so you can just go to https://<addr> to 
see who owns them. 

The first one will also tell you the vendor as they didn’t customize the 
landing page…

> On 22 Jun 2016, at 7:11 PM, Paul Wouters <[email protected]> wrote:
> 
> 
> Hi,
> 
> One of my machines is seeing a continous stream of NAT-T keepalive probes
> for which we have no state (and for which we had no state for days or
> weeks or ever). These always seem to come in sets of 3 probes at once,
> every 20 seconds. And oddly enough on port 500, not 4500. Containing
> the 1 byte 0xFF NAT-Keepalive payload.
> 
> Currently offending IPs are: 87.236.232.253, 46.34.71.246 and 64.115.92.187.
> 
> Small pcap entry attached.
> 
> Has oneone experienced these before? Is this a known bad device? Or am I
> just special? :)
> 
> Paul
> 
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