Patent ID: 9467375
Filing Date: 2016-10-11
CPC Classification: H04L

Claim Text:
1. A method for use in migration of an internet protocol, IP, service from a first server to a second server in an IP network, the method comprising: prior to receipt of a plurality of incoming IP packets, reconfiguring a router device separate from the first server, to replace a current mapping of a single IP address to a first physical address with a further mapping of the single IP address to a physical address associated with a migration server, whereby the plurality of incoming IP packets is received at the migration server, and wherein the migration server is separate from the first server; at the migration server separate from the first server, receiving the plurality of incoming IP packets directed at the single IP address associated with the IP service, wherein the first server has the first physical address and the second server has a second physical address, and wherein the physical address associated with the migration server comprises a third physical address different from the second physical address; at the migration server, determining, on the basis of one or more source characteristics associated with IP packets in the plurality, that a first subset of packets in the plurality originated from one or more client devices which have not been migrated to the second server and that a second subset in the plurality originated from one or more client devices which have been migrated to the second server; and in response to the determination, forwarding, at the migration server, IP packets determined to be in the first subset to the first physical address associated with the first server for processing at the first server; and in response to the determination, forwarding, at the migration server, IP packets determined to be in the second subset to the second physical address associated with the second server, for processing at the second server.