Citrix Systems Network Router NETSCALER 9.3 Manuel d'utilisateur télécharger pdf (Page 168)

How AppFlow Works

In the most common deployment scenario, inbound traffic flows to a Virtual IP address

(VIP) on the NetScaler appliance and is load balanced to a server. Outbound traffic

flows from the server to a mapped or subnet IP address on the NetScaler and from the

VIP to the client. A flow is a unidirectional collection of IP packets identified by the

following five tuples: sourceIP, sourcePort, destIP, destPort, and protocol.

The following figure describes how the AppFlow feature works.

Figure 7-1. NetScaler Flow Sequence

As shown in the figure, the network flow identifiers for each leg of a transaction

depend on the direction of the traffic.

The different flows that form a flow record are:

Flow1: <Client-IP, Client-Port, VIP-IP, VIP-port, Protocol>

Flow2: <NS-MIP/SNIP, NS-port, Server-IP, Server-Port, Protocol>

Flow3: <Server-IP, Server-Port, NS-MIP/SNIP, NS-Port, Protocol>

Flow4: <VIP-IP, VIP-port, Client-IP, Client-Port, Protocol>

Chapter 7 AppFlow

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Citrix Systems Network Router NETSCALER 9.3 Manuel d'utilisateur Page 168