Patent ID: 7830911
Filing Date: 2010-11-09
Classification: H04L

Abstract:
1. A communication apparatus comprising: a first retrieving unit configured to retrieve Internet Protocol Version 6 (IPv6) connecting addresses for connecting to an external communication apparatus on a network; a second retrieving unit configured to retrieve an Internet Protocol Version 4 (IPv4) address assigned to the external communication apparatus; a setting unit configured to set for each retrieved IPv6 connecting addresses, a priority for representing a level preferably used when connecting to the external communication apparatus; a determining unit configured to determine for each retrieved IPv6 connecting addresses, whether a second bit string that forms the retrieved IPv4 address is included in a first bit string that forms the IPv6 connecting address; a changing unit configured to change the priority of the IPv6 connecting address that is determined that the second bit string is included in the first bit string from among the retrieved IPv6 connecting addresses; and a selecting unit configured to select a IPv6 connecting address having a higher priority during establishing a connection with the external communication apparatus.