Traffic Log - NTP Logs Why..??

Hi Guys,

Why in a SEP client appears IP address of another clients in the traffic log of the a SEP client..?

Example:

(This image log is taken of the SEP client with IP 192.168.0.111)

Image may be NSFW.
Clik here to view.

Is necessary register this..?

Is possible to avoid it..?

Thanks.