Patent ID: 7426576
Filing Date: 2008-09-16
Classification: H04L,Y10S

Abstract:
1. A method for a computer implemented resolver to perform name resolutions, comprising the steps: maintaining a domain name configuration list, the domain name configuration list indicating a domain name order, the domain name order indicating an order in which domain name servers are contacted by the resolver, and the domain name list keeping a record of whether a domain name server of the plurality of known domain name servers is accessible or inaccessible; receiving a first request to resolve a network address; sending a second request to resolve the network address to a first accessible domain name server in the domain name order, and sending the same second request to at least one inaccessible domain name server appearing in the domain name order before the first accessible domain name server in order to determine if the at least one inaccessible domain name server has become accessible since the domain name list was prepared.