KEMP Technologies LoadMaster 1500 Installation And Configuration Manual page 66

The pull-down list gives you the option to select the type of persistence. These are:
IP-based Persistence (SRC)
The source IP address (of the requesting client) is used as the key for persistency in this case. The netmask
determines how the Balancer sees a 'client' in the context of persistence. For example:
When the netmask is set to 255.255.255.255 (the default) then every individual IP address qualifies as a valid
persistent context. So, a client with the IP address 200.190.125.67 connects, and its connection to a
particular real server is remembered. The client then ends the session and disconnects. A short time later, the
client begins another session, but this time its IP address is given as 200.190.125.44 - it will not necessarily
be directed to the same real server as before.
However, using the example above, if the netmask is set to 255.255.255.0, then all clients connecting with an
IP address of 200.190.125.X will be grouped together and directed to the same real server, until the timeout
has expired.
URL Persistence
Requests to the same URL go to the same server.
Cookie Persistence
The Balancer checks the value of a specially set cookie in the HTTP header.
Connections with the same cookie will go to the same real server.
(Standard) Cookie
The real server must be configured to set the special cookie.
(Standard) Cookie-Src
If cookie persistence fails, it reverts to source-based persistence.
Active Cookie
The Balancer automatically sets the special cookie.
Active Cookie-Src
If active cookie persistence fails, it reverts to source-based persistence.
Host Persistence
A request to the same host always goes to the same server.
SSL Persistence
The SSL session ID is used to keep a session connected to the same server.
Note: SSL acceleration cannot be used with this method.
Port Following
Port following enables a switch from an HTTP connection to an HTTPS (SSL) connection to be persistent on the
same real server. Port following can only be switched on if the current service is an HTTPS service, and if
there exists a HTTP service with the same IP address as this HTTPS service.
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