H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 29/04 (2006.01) H04L 12/12 (2006.01) H04L 29/06 (2006.01) H04L 29/12 (2006.01)
Patent
CA 2230550
Methods and apparatus for hosting a network service on a cluster of servers, each including a primary and a secondary Internet Protocol (IP) address. A common cluster address is assigned as the secondary address to each of the servers in the cluster. The cluster address may be assigned in UNIX-based servers using an ifconfig alias option, and may be a ghost IP address that is not used as a primary address by any server in the cluster. Client requests directed to the cluster address are dispatched such that only one of the servers of the cluster responds to a given client request. The dispatching may use a routing-based technique, in which all client requests directed to the cluster address are routed to a dispatcher connected to the local network of the server cluster. The dispatcher then applies a hash function to the client IP address in order to select one of the servers to process the request. The dispatching may alternatively use a broadcast- based technique, in which a router broadcasts client requests having the cluster address to all of the servers of the cluster over a local network. The servers then each provide a filtering routine, which may involve comparing a server identifier with a hash value generated from a client address, in order to ensure that only one server responds to each request broadcast by the router.
Chung Pi-Yu
Damani Om Prakash
Huang Yennun
Kintala Chandra Mohan Rao
Wang Yi-Min
At&t Corp.
Kirby Eades Gale Baker
Lucent Technologies Inc.
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