Logical Server

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Use this window to create or edit a logical server.

Logical Servers

A Logical Server is a group of machines that provides the same services. The workload of this group is distributed between all its members.

When a Server group is stipulated in the Servers group field, the client is bound to this physical server. In Persistent server mode the client and the physical server are bound for the duration of the session.

• Persistency by Service — once a client is connected to a physical server for a specified service, subsequent connection to the same Logical Server and the same service will be redirected to the same physical server for the duration of the session.
• Persistency by Server — once a client is connected to a physical server, subsequent connections to the same Logical Server (for any service) will be redirected to the same physical server for the duration of the session.

Balance Method

The load balancing algorithm stipulates how the traffic is balanced between the servers. There are several types of balancing methods:

• Server Load — The Security Gateway determines which Security Management Server is best equipped to handle the new connection.
• Round Trip Time — On the basis of the shortest round trip time between Security Gateway and the servers, executed by a simple ping, the Security Gateway determines which Security Management Server is best equipped to handle the new connection.
• Round Robin — the new connection is assigned to the first available server.
• Random — the new connection is assigned to a server at random.
• Domain — the new connection is assigned to a server based on domain names.