Configuration of parameter "subID"

The inner server only sends the flag syncRequired to a DMZ server, until that DMZ server has refreshed its cache. In a DMZ cluster, the inner server needs to distinguish between the different DMZ servers. To achieve this, the subID is used. During the DMZ server start, a value for the subID is computed from the host name and the IP addresses of the server. The value is in the range of 0...31, therefore it cannot be ruled out that two DMZ servers do receive an identical subID, although it is not very likely. In an immediate update, only one of the servers would be updated (which one is random). In this case, a unique subID for each DMZ server needs to be guaranteed through explicit configuration.