Alek,
please file a bug on github (menu About of ntopng) for nDPI and attach a pcap 
file of unknown traffic for inspection.

Regards Luca

> On 03 Sep 2015, at 09:49, alek markus <[email protected]> wrote:
> 
> Hey ,
> 
> i have dumped the Unkown Data to pcap file , and opened in Wireshark
> 
> i can see that all the Destination Ip is my Exchange server and Sometimes The 
> Exchange Server is the Source and my Firewall become the Destination Host
> 
> So why ntopng is not detect this traffic as SMTP protcol ? 
> 
>  i have noticed that since i have updated ntopng to the latest version i can 
> see that Protcol SMTP has only 1.63 GB 
> 
> and before i updated  ntopng , there was no problem with SMTP detection
> 
>  
> 
> 
> Best Regards,
> Alek
> 
> From: [email protected]
> To: [email protected]
> Date: Wed, 2 Sep 2015 16:54:59 +0300
> Subject: Re: [Ntop-misc] hello , i have 2 questions about requierments for 
> ntopng and Unkown protocol
> 
> btw , i have noticed that Unkown protocol started to grow before i updated 
> from ntopng Community v.2.0.150531
> 
> to ntopng Community v.2.0.150827  
> 
> i have 24 gb of Unkown Protocol
> 
> Best Regards,
> Alek
> 
> From: [email protected]
> Date: Wed, 2 Sep 2015 15:46:48 +0200
> To: [email protected]
> Subject: Re: [Ntop-misc] hello ,      i have 2 questions about requierments 
> for ntopng and Unkown protocol
> 
> Your machine is fast enough to process much more traffic than what you have, 
> thus no problem.
> Please check what traffic is not detected and let us know.
> 
> Thank you
> Alfredo
> 
> On 02 Sep 2015, at 15:42, alek markus <[email protected] 
> <mailto:[email protected]>> wrote:
> 
> Hello Alfredo,
> 
> the avg traffic rate is : 4.94 Mbit (looking in historical activity for thae 
> last 6 hours)
> 
> about  sample some traffic and check with wireshark I have not tried yet , 
> the problem is  that i dont know when the unknown traffic is received by my  
> workstations
> 
> i need to capture for a long time and start to analyze it 
> 
> 
> From: [email protected] <mailto:[email protected]>
> Date: Wed, 2 Sep 2015 15:31:36 +0200
> To: [email protected] <mailto:[email protected]>
> Subject: Re: [Ntop-misc] hello ,      i have 2 questions about requierments 
> for ntopng and Unkown protocol
> 
> Hi Alek
> 
> On 02 Sep 2015, at 15:12, alek markus <[email protected] 
> <mailto:[email protected]>> wrote:
> 
> Hello,
> 
> the server that ntopng is installed right now have :
> 
> 1. 
> 
>  1GB ethrnet network card
> 
> Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz (4 cpu's)
> 
> is that enough for traffic analysis ? 
> 
> What is your avg traffic rate?
> 
> 2. i have read in ntop document that :
> 
> TCP Flows can be identified in up to 15 packets in total, otherwise the flow 
> is marked as “Unknown”.
> 
> i can see in my ntopng setup that i have a lot of Data : "Unkown protocol" 
> how can i fix that ? 
> 
> Are you able to sample some traffic and check with Wireshark what kind of 
> traffic is not recognised by ntopng?
> 
> Brest Regards
> Alfredo
> 
> 
> Best Regards,
> Alek
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