It stands for Linux Virtual Server via Network Address Translation, an IP load balancing technology implemented in LVS.
The Network Address Translation technology is used to rewrite the destination address (ip address and port number of virtual service) of request packets to that of selected real server, and rewrite the source address of response packets back to that of virtual service, so that clients don't know which real server performs the service. In this way, parallel services of multiple real servers can be grouped as a virtual service at a single IP address.
- See more information about Linux Virtual Server via Network Address Translation at http://www.linuxvirtualserver.org/VS-NAT.html
- LVS-NAT troubleshooting HOWTO from Julian
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