HP e-Commerce / XML director server appliance sa8250 - Users Guide
C H A P T E R 2 Server Configuration Options
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Multi-hop Source Address Preservation
It is possible in sophisticated network topologies to require requests
to pass through two SA8250s. In such configurations, the SA8250
topologically closest to the clients must be configured with the Multi-
hop Source Address Preservation (MSAP) feature enabled.
MSAP allows requests to pass through two cascaded SA8250s in
different geographical areas. Enabling MSAP ensures that the actual
IP addresses of requesting clients, rather than the virtual IP address of
the SA8250 that delivered the request, are recorded in the server logs.
This is similar to SAP (described in the preceding section), however
this feature allows SA8250s to be geographically-dispersed:
MSAP on a Geographically-Dispersed Network
NOTE: MSAP must be
disabled (the default).
In the figure above, a client in San Diego sends a request to a
fulfillment server in Boston. MSAP is enabled on SA8250 Broker 1,
and Server 1’s default route is set to SA8250 Broker 2. The SA8250
Broker 2 doesn’t need SAP enabled for this service, since SAP is
automatically used on MSAP requests from SA8250 Broker 1. In this
configuration, the San Diego client's IP address will be preserved in
the Boston fulfillment servers' logs. To enable MSAP, type this
command:
config policygroup <name> service <name> server
<name> port <port> msap enable
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