Hp Traffic Director sa7220 Manual de usuario descargar pdf (Pagina 25)

C H A P T E R 2 Services

Layer 4 (HOT) Services

HOT services provide very fast brokering performance. HOT

services are defined in full by their VIP and port number.

In HOT or “Brokered” mode, the SA8220 performs Network Address

Translation (NAT) on all incoming packets passing through the

connection. NAT changes the destination IP address and port of

incoming packets to those of the selected fulfillment server. The

source IP address is modified to be that of the SA8220.

Fulfillment servers can be addressable by IP address, and thus can be

on either local or wide area networks.

By default in HOT mode, the fulfillment server sees all requests as

coming from the SA8220 rather than from the actual client. In some

environments, it may be desirable to have the fulfillment server see

the requests as if they were coming directly from the client. The

Source Address Preservation (SAP) mode of the SA8220 allows this

to happen (see “Source Address Preservation” for more detailed

information).

Layer 7 (RICH) Services (all models except the

SA7200)

The SA8220 allows more flexible service fulfillment for RICH (Real-

time Intelligent Content Handling) services. The service type

“RICH_HTTP” is available on the SA8220 and enables it to make

fulfillment decisions based on the content of the URL of each client

HTTP request. RICH services also include advanced error detection,

and automatic resubmission of HTTP requests under most error

conditions.

As with HOT services above, fulfillment servers can be addressable

by IP address, and thus can be on either local or wide area networks.

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Hp Traffic Director sa7220 Manual de usuario Pagina 25