Extreme Networks Px Series, Installation And Configuration Manual

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Px Series Application Switch Installation and Configuration Guide 1-5
Load Balancing Modes
chosen to process the request, using a source IP address that is part of a proxy pool
inside the application switch.
After a connection is established between the application switch and the real server, the
application switch forwards the buffered data to the server. The server sends any
response to the application switch. The application switch translates the IP source
address and port numbers appropriately, along with the TCP sequence and
acknowledgment numbers, and then forwards the data to the real client on the Internet.
Return traffic from the real server does not require content analysis, and is simply
rewritten by the NAT engine.
Figure 3 illustrates the sequence used to establish a layer 7 request.
Figure 1-3: Establishing a layer 7 request