I am monitoring my Cisco routers WAN connection and have always noticed a trend where every 15 minutes or so the outbound traffic will read zero for one reading.
I have taken a screen shot so you can see what I mean.
http://s22.postimg.org/c318sqb4h/prtg.png
The dark blue line is the outbound traffic and as you can see every 15 minutes I see the issue happen. The issue doesn't seem to be happening with the green traffic in side.
Thanks, Jon
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