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How to see ingress and egress bandwidth usage using Netflow

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Hi ,

i am new to PRTG. I am configuring Netflow on all my branch routers. Branch routers are connected to HQ using MPLS. Below is the template i used on all routers. i am changing site specific infomation as required by each site.

router-2621(config)#ip flow-export destination 172.19.194.12 2250 
router-2621(config)#ip flow-export source FastEthernet 0/1 (This should be changed to relevant routers LAN interface name)
router-2621(config)#ip flow-export version 9
router-2621(config)#ip flow-cache timeout active 1
router-2621(config)#ip flow-cache timeout inactive 15
router-2621(config)#snmp-server ifindex persist
router-2621(config)#ip flow-top-talkers
router-2621(config)#top 10
router-2621(config-flow-top-talkers)#sort bytes
router-2621(config)#^Z
router#write mem


Interface Configuration mode

router-2621(config)#interface FastEthernet 0/1 (This should be changed to relevant routers LAN interface)
router-2621(config-if)#ip route-cache flow
router-2621(config-if)#ip flow ingress
router-2621(config-if)#ip flow egress 
router-2621(config-if)#exit
router#write mem

My questions is i am using Netflow V9 standard sensor and it shows me bandwidth usage is only one traffic graph. I expecting to see 2 graphs one for ingress and other for egress. So the graph that it shown is it only showing one direction or total of both direction( ingress and egress) ?

Thanks, Sanka.

flow netflow prtg

Created on Jan 14, 2015 12:41:41 AM by  sankademel (0) 1

Last change on Dec 2, 2021 8:26:21 AM by  Maike Guba [Paessler Support]



1 Reply

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Hello,

Thank you very much for using PRTG. The Netflow sensors do indeed not show Traffic In & Out as there is no exact relation for the "direction" in the packet data (seen in relation to an interface), as there is with SNMP where directly OctetsIN / OctetsOUT are read from the device.
You can achieve this though using Custom Netflow Sensors (with custom Channel Definitions).

best regards.

Created on Jan 15, 2015 4:01:37 PM by  Torsten Lindner [Paessler Support]



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