HP P4522A - Traffic Management Server Sa8220 User Manual page 86

C H A P T E R 4
Control or Display
Insert Source IP in
HTTP Header
(RICH only on all
models except the
SA7200)
Sticky Mode
NOTE: If using SSL
services on the
SA8200/SA8220, the
SSL session ID
maintains a sticky
relationship when
Source IP sticky is
selected
Sticky Timeout
Protocol
Status
74
HP Traffic Director Server Appliances User Guide
Description
This check box specifies whether or not the Source IP address is
embedded within the HTTP header information.
The SA8220 is configured to maintain a session's state so that serial
requests from a single client are allocated to the same server. This is
called a "sticky" port. This setting may be disabled, based on Source
IP, or based on a Cookie as described below:
Source IP: Source IP sticky mode uses the client's source IP address
to identify a series of requests to be directed to a single server.
Cookie: In cases where requests come through a proxy server, all
requests display to originate from that server's IP address, thus IP
address is of no use in identifying individual requestors. Cookie sticky
mode provides an active method of identifying requestors in such
situations. When Cookie sticky mode is enabled, a cookie is given to
requesting browsers. Subsequent requests from clients who have
received cookies contain identifying information allowing the SA8220
to direct them to a single server. Cookie mode is available only for
RICH_HTTP, so it is not available on the SA7200.
The current software version for the SA8220 treats the timeout
differently for cookie versus Source IP sticky. With Source IP sticky,
the timeout is reset with every connection from the client (so that the
timeout is effectively an "idle time"). With cookie sticky, the timeout
starts with the first connection from the client to the server, and never
gets reset. When the cookie expires, even if actively being used, the
next connection will be load balanced to a new server.
Work around: We recommend that you set the cookie sticky timeout
value to at least 1.5 times the maximum amount of time a user will
expect to be stuck to a server. The default is 90 seconds
This read-only field displays the protocol of the Service (TCP).
This read-only field displays the status of the selected Service
("Active" or "Inactive").