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quick Netflow question

Posted on 2009-05-04
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Last Modified: 2012-05-06
Is it best practice to enable netflow on internal or external interfaces.
Also, which direction?

We have a few remote sites connecting back to us via MPLS. I am monitoring their serial interfaces (in the ingress direction). Is this sufficient to analyze bandwidth utilization? Or should I montior egress too?

thanks
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Question by:dissolved
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JFrederick29 earned 500 total points
ID: 24295850
Typically you enable Netflow on both the internal (LAN) and external (WAN) interfaces since it collects ingress.  You can enable egress collection on newer IOS but it does the same thing as collecting inbound on both the LAN and WAN interfaces.

So, either monitor ingress and egress on the serial or monitor ingress on the LAN and WAN interfaces.  When monitoring bandwidth, you should monitor both ingress and egress so you can monitor upload and download bandwidth utilization.
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by:dissolved
ID: 31577566
great, thanks
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Author Comment

by:dissolved
ID: 24297438
J, can you please look at this? I posted the config from our headend ASA. Can you tell me if there is anything in this config, which would cause the ASA to drop all VPN connections every hour or so?

http://www.experts-exchange.com/Security/Software_Firewalls/Enterprise_Firewalls/Cisco_PIX_Firewall/Q_24378722.html
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