Patent ID: 9219781
Filing Date: 2015-12-22
Classification: H04L

Abstract:
1. A method for using a preferred backup list of global server load balancing (GSLB) service locations, the method comprising: (a) establishing, by a device intermediary to a plurality of clients and a plurality of global server load balancing (GSLB) service locations, a domain name service (DNS) policy that specifies an ordered list of preferred locations and a rule comprising an expression for matching a location of the client; (b) receiving, by the device, a DNS request of a client of the plurality of clients, the request identifying an internet protocol (IP) address of the client; (c) identifying, by the device for the DNS request, the DNS policy based on matching a location of the client corresponding to the IP address of the client to the expression of the rule of the DNS policy; (d) comparing, by the device responsive to the DNS policy, each preferred location of the ordered list of preferred locations to locations of GSLB services managed by the device; and (e) selecting, by the device based on the comparison, a preferred location from the ordered list of preferred locations to which to resolve the DNS request.