HP Traffic Director sa7220 - Manual (Page 226)

C H A P T E R 6 HP Traffic Director Server Appliances User Guide
214
Scenario 2:
Load
Balancing
Servers with
Source
Address
Preservation In its default operating mode, the SA8220 alters source and
destination packet addresses so that fulfillment servers see only the
SA8220’s address. However, under some circumstances,
administrators may want to preserve incoming clients’ addresses in
the server log files.
The SA8220’s Source Address Preservation (SAP) mode ensures that
a client’s address remains as the source address of packets forwarded
to the server, thus ensuring the maintenance of a record of client
addresses in the server logs. This scenario illustrates the steps
required to enable Source Address Preservation and configure the
SA8220 to broadcast routes.
The figure below shows the network diagram for scenario 2.
Network Diagram for Scenario 2
The next figure shows the data flow diagram for scenario 2.
Data Flow Diagram for Scenario 2
Client
Server
sa8220
Internet
Switch
Client B roker S erver
S YN S YN
S YN/ACK
S YN/ACK
ACK ACK
Get UR L Get UR L
Data
Data
Client B roker S erver
S YN S YN
S YN/ACK
S YN/ACK
ACK ACK
Get UR L Get UR L
Data
Data