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Is there a way to tighten up what I see in Netflow?

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I have several different locations (Cities) on my network. Each 3rd octet (x.x.3rd.x) is a separate network (See chart below). The issue I'm having is when I look at my top talkers in Netflow v5 I see traffic from all my networks combined. I'd would only like to only see traffic that pertains to the 3rd octet. Is there anyway of setting up in the Cisco router or in PRTG to drill down and only see the network I setup per sub net?

Source IP Destination IP Bytes Other 58 MByte 26 % 1. server1.mydomain.com (192.168.36.2) lt1234.mydomain.com (192.168.2.134) 34 MByte 15 % 2. server1.mydomain.com (192.168.36.2) dt234.mydomain.com (192.168.3.70) 13 MByte 6 % 3. server1.mydomain.com (192.168.36.2) lt1091.mydomain.com (192.168.25.244) 10 MByte 5 % 4. lt1253.mydomain.com (192.168.75.80) server1.mydomain.com (192.168.11.21) 9,821 KByte 4 % 5. lt1281.mydomain.com (192.168.71.128) server1.mydomain.com (192.168.32.1) 5,917 KByte 3 %

cisco netflow-v5 sensor toplist

Created on Jan 26, 2016 10:14:12 PM by  Johnd101 (0) 1



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You could use one Netflow sensor per octet and have it filter the incoming packets by IP with the include filter:

Sensor for City #1

(SourceIP[192.168.1.*] or DestinationIP[192.168.1.*]) 


Sensor for City #2

(SourceIP[192.168.2.*] or DestinationIP[192.168.2.*]) 

and so on :)

Created on Jan 28, 2016 9:41:22 AM by  Stephan Linke [Paessler Support]



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