D-Link DFL-2500 User Guide - Page 282
Scalability, Optimized Capability, Availability, Security, Ease of Maintenance
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24.1. Overview 263 tracking the status of the servers, and noticing the load distribution to redirect traffic if there is any server failure. 24.1.3 Benefits The SLB solution provides more advanced and flexible traffic management, and stronger processing power, compared to a single sever implementation. The significant advantages are: Scalability SLB dramatically improves the scalability of an application or server farm by distributing the load across multiple servers. The addition of new servers, and the removal or failure of existing servers, can occur at any time on demand, without experiencing downtime. Optimized Capability SLB helps to reduce the workload of each server, and hence, gives faster response to users' requests. Any single server in the server farm will not be overwhelmed by unusually heavy traffic that it is not capable to handle. The additional load can be taken over by other active servers automatically. Availability Load distribution and server monitoring cooperate to achieve automatic failover. With these two features, SLB is able to direct the traffic to alternative servers if a server fails. Security In SLB module, a public server address is present to the clients, representing the server farm. The real addresses of the servers are hid behind such public address and are never disclosed to the external network(covered by 24.2 SLB Implementation). It can filter unwanted traffic based on both IP address and TCP or UDP port numbers, and helps to protect against multiple forms of denial-of-service(DoS) attacks. Ease of Maintenance Administration of server applications is easier. The sever farm is seen as a single virtual server by the Clients with one public address; no administration is required for real server changes, which are transparent to the external network. D-Link Firewalls User's Guide
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