It stands for Linux Virtual Server via IP Tunneling, an IP load balancing technology implemented in LVS.
IP tunneling (IP encapsulation) is a technique to encapsulate IP datagram within IP datagram, which allows datagrams destined for one IP address to be wrapped and redirected to another IP address. This technique can be used to build a virtual server that the load balancer tunnels the request packets to the different servers, and the servers process the requests and return the results to the clients directly, thus the service can still appear as a virtual service on a single IP address.
For ARP issue in the LVS/TUN cluster, see the article ARP Issues in LVS/DR and LVS/TUN Clusters.
If real servers run UDP service, it is probably worth reading the article UDP service binding issue in LVS/DR and LVS/TUN.
- See more information about Linux Virtual Server via IP Tunneling at http://www.linuxvirtualserver.org/VS-IPTunneling.html
- LVS-TUN troubleshooting HOWTO from Julian
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