Gratuitous ARP is a feature of the Address Resolution Protocol wherein the host broadcasts an ARP request for its own hardware address.
Eddie is a high availability clustering tool. It is an open source, 100% software solution written primarily in the functional programming language Erlang (http://www.erlang.org/) and is available for Solaris, Linux and *BSD.
Balance from inLab Software GmBH is a simple, generic TCP proxy, which allows simple round-robin load balancing and graceful failover between several destination servers.
Balance is available at http://balance.sourceforge.net/.
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