tips:ingress-egress-netflow
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tips:ingress-egress-netflow [2020/11/27 14:04] – [Example : Ingress and Egress enabled on both downstream and upstream interfaces] veera | tips:ingress-egress-netflow [2020/11/27 16:05] (current) – [Enabling Ingress and Egress Netflow - issues and valid use cases] veera | ||
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Netflow has historically been an ingress only technology. Later versions of Netflow added the option to enable netflow at the egress interface as well. One way wonder how an analyst can get both the interfaces if Netflow is enabled in one direction only. The answer lies in the structure of the Netflow record. | Netflow has historically been an ingress only technology. Later versions of Netflow added the option to enable netflow at the egress interface as well. One way wonder how an analyst can get both the interfaces if Netflow is enabled in one direction only. The answer lies in the structure of the Netflow record. | ||
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===== Enabling both ingress and egress can result in inconsistent data ===== | ===== Enabling both ingress and egress can result in inconsistent data ===== | ||
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The following diagram shows a valid use case. | The following diagram shows a valid use case. | ||
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In this example the red and blue flows are measured for Netflow at the upstream interfaces only. Hence there will be no duplicate or inconsistent data. | In this example the red and blue flows are measured for Netflow at the upstream interfaces only. Hence there will be no duplicate or inconsistent data. | ||
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//Egress NetFlow accounting might adversely affect network performance because of the additional accounting-related computation that occurs in the traffic-forwarding path of the router.// | //Egress NetFlow accounting might adversely affect network performance because of the additional accounting-related computation that occurs in the traffic-forwarding path of the router.// | ||
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+ | ===== Configuration options in Trisul ===== | ||
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+ | The following are relevant [[https:// | ||
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+ | * '' | ||
+ | * '' | ||
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+ | Trisul automatically detects duplicate flow records |
tips/ingress-egress-netflow.txt · Last modified: 2020/11/27 16:05 by veera