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Traffic monitoring on Tunnel

Posted on 2016-08-16
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Last Modified: 2016-09-07
Hi ;
We have an internet connection connecting the site to Data center. We are doing SNMP polling on the Tunnel interface of cisco router and are getting the capacity close to zero, but when the physical interface (Fa0/0) is monitored the traffic reading goes up substantially. Can anyone please explain why it is happening?
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Question by:totaram
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Expert Comment

by:harbor235
ID: 41759302
Perhaps you are seeing the network management system poll/monitor the device/interface.
You can easily check this with netflow data directly on the router.

enable netflow or add acls to capture the traffic

show ip cache flow - will display traffic flowing through the router


harbor235 ;}
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Author Comment

by:totaram
ID: 41760411
Yes.. that is the issue.. why are we not able to see much data through the virtual tunnel int that we configured for the
IPSEC?

One small question: How do we enable netflow on the router? I have not done that before. Do we have to have netflow tool?

Thanks
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Expert Comment

by:eeRoot
ID: 41760418
Do you see statistics on the tunnel interface if you use the "show interface ..." command?
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Author Comment

by:totaram
ID: 41760562
Yes.. I see the stats on both sh int commands.. (Tunnel as well as Fa0/0)
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harbor235 earned 2000 total points
ID: 41779772
You need a netflow collector to export the data, but you can view the currently cached netflow data that is kept on the router via show ip cache flow

To configure netflow do the following;

on the interface in which you want to capture netflow

ip flow ingress
ip flow egress

Validate with show ip cache flow - to view netflow stats

If you want to export that data top a collector add the following cmds

ip flow-export version 5 /9  - 5 is most common, 9 has additional capabilities and is newer
ip flow-export destination <collector_ip> <collector netflow port>
ip flow-export source loopback?   - source of traffic when exporting,

There are a couple additional options but this will get you going

Is that it?

harbor235 ;}
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Author Comment

by:totaram
ID: 41788782
Thanks
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Author Comment

by:totaram
ID: 41788783
Thanks
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