[Config] NetFlow Ingress/Egress/Both? in Cisco http://www.dslreports.com/forum/r19332065 en Fri, 27 Nov 2009 03:47:05 EDT Fri, 27 Nov 2009 03:47:05 EDT Re: [Config] NetFlow Ingress/Egress/Both? http://www.dslreports.com/forum/remark,19345528 yaplej : Im trying SolarWinds Orion NetFlow Traffic Analyzer. Currently it only supports NetFlow v5 though. They plan on adding v9 sometime in 2008.]]> http://www.dslreports.com/forum/remark,19345528 Mon, 29 Oct 2007 16:18:57 EDT Re: [Config] NetFlow Ingress/Egress/Both? http://www.dslreports.com/forum/remark,19345463 carp : Turn Netflow on the DS3 and the LAN interface(s) that traffic will flow through. That would let you see in and out.

ip route-cache flow

should be all you need on each interface. Which collector are you trying out?]]> http://www.dslreports.com/forum/remark,19345463 Mon, 29 Oct 2007 16:03:17 EDT Re: [Config] NetFlow Ingress/Egress/Both? http://www.dslreports.com/forum/remark,19332751 TomS_ : NetFlow data is only collected on packets comming into an interface.

Therefore, if you want to measure traffic in both directions you need to enable NetFlow collection on your routers LAN and WAN interfaces.

It really depends on how accurate your statistics need to be.

Consider the attached diagram.

NetFlow enabled at each of the red dots will collect statistics for traffic coming from each LAN. In the case of the T1 link, it has been enabled on router access2 to preserve bandwidth on the T1.

NetFlow enabled at each of the purple dots will collect statistics for traffic comming into your network.

This way you can account for all traffic between internal hosts, and to/from the Internet.
Click for full size
]]> http://www.dslreports.com/forum/remark,19332751 Sat, 27 Oct 2007 03:28:46 EDT [Config] NetFlow Ingress/Egress/Both? http://www.dslreports.com/forum/remark,19332065 yaplej : I just got a trial version of a NetFlow data collector, and want to configure NetFlow in our DS3 interface. Should I enable NetFlow for only one direction, or both? The DS3 interface goes out to our MPLS network.

What points should I setup NetFlow collection from, and what direction? I could do all WAN points in both directions, but that might be overkill.

Thanks.]]> http://www.dslreports.com/forum/remark,19332065 Fri, 26 Oct 2007 23:06:27 EDT