Re: [Ntop] Combining subnet statistics

[Simone Mainardi]

Peter,

> On 13 Feb 2018, at 22:49, Peter Shute  wrote:
> 
> Simone Mainardi wrote:
> 
>>> I have this running now, so I can't try creating host pools unless I undo
>> those changes.
>>> 
>>> One thing I've noticed with dynamic interfaces is that if I select one, then
>> click on the chart icon, the traffic peaks seem way too  high. Eg 85Mbps when
>> we only have a 14Mbps link.
>> 
>> Peaks you are seeing are very likely due to the quantized nature of flows.
>> Your netflow exporters do periodic exports of active flows -- say every 2
>> minutes -- so the ntopng/nProbe pair is not able to know what happened
>> during the 2 minutes, it just receives the exported flow at the end of the
>> period. This translates into a potentially high volume of traffic in a very 
>> short
>> period that determines the peak. However, total values over time must be
>> consistent.
> 
> That makes sense. I wonder if it would be helpful to add a note about that on 
> the charts so that people understand their limitations.

Correct, we will add it.

> 
> Does this mean I can still use those charts to look for periods of high 
> usage, but should take the vertical scale with a grain of salt?

Correct. The interface chart with 1-second data points -- say the latest 10 
minutes -- should be taken with a grain of salt on configurations that involve 
flows collection. 
Selecting wider time ranges will automatically average out short peaks and will 
provide you more accurate information.

> 
> Peter Shute
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Re: [Ntop] Disappearing ntopng menu items

[Simone Mainardi]

Peter,


> On 14 Feb 2018, at 00:11, Peter Shute  wrote:
> 
> If I log into ntopng, then leave it in the browser for a long time (hours? 
> overnight?), some menu items disappear. For example I no longer see 
> Preferences in the Settings menu, and the Power menu is no longer visible, so 
> I can't access the Logout command.
> 
> Logging out and in again fixes this, but the only way to log out is to 
> manually add "logout.lua" to the URL.

This is normal due to the expiration of the session you are authenticated with. 
If you don't want the autologout, please use:

[--disable-autologout|-q]   | Disable web logout for inactivity


Simone

> 
> I don't think I've seen this behaviour before upgrading to v.3.3.180211, but 
> I also vaguely remember ticking a box to stay logged in recently. I'm not 
> sure if it was ntopng or some other site.
> 
> Peter Shute 
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