Citrix Systems CITRIX NETSCALER 9.3 Benutzerhandbuch
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.
(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.
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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