Parameter
wdisp/HTTPS/sticky_mask
Short text
HTTPS ROUTER protocol: bit mask for stickiness of client IP addresses
Parameter Description
Caution
This parameter is only required for HTTPS connections. The parameter has no meaning for HTTP connections.
This parameter describes a bit mask for client IP addresses. The IP address of a client that connects to the Web Dispatcher is linked to this bit mask (AND link), and the result is used for the load balancing of clients.
This allows you to combine groups of client IP addresses. This functionality is required because large internet providers use several proxies (with different IP addresses) but the clients must be handled in the same way (for applications with a state in the server).
Application Area
SAP Web Dispatcher
Default Value
255.255.240.0
This means that the last 12 bits of the client IP address are no longer significant (are not distinguished).
Who is permitted to make changes?
Customer
Operating System Restrictions
None
Database System Restrictions
None
Are other parameters affected or dependent?
The size of the mapping table in memory is influenced by the sticky mask. The more bits that are set to 0, the fewer different client IP addresses need to be managed: If all bits are set, there can be 2^32 possible entries. If 12 bits are 0, there can be 2^20 entries: number of entries = 2^(32-#0bits). The parameter wdisp/HTTPS/max_client_ip_entries determines the size of the table in memory.
Values allowed
Character string containing four numerical entries (each 0-255), which are separated from each other by a period (.). No periods and no numerical values can be omitted.
Examples of correct values:
255.255.255.255 or 0.0.0.0
