Patent ID: 7295512
Filing Date: 2007-11-13
Classification: H04L

Abstract:
1. A TCP communication system wherein communication is carried out between a source host and a destination host via a network system and a time until a window size of the source host reaches its upper limit is longer than a time until reception of a TCP acknowledgement, said TCP communication system comprising: the network system; and a single edge router connected to a local system to which a host for communication belongs, wherein the edge router is located between the source host and the destination host, wherein the edge router comprises: means for terminating a TCP connection between the source host and the destination host; and first and second address translation means for performing address translation operations of a TCP packet to cause the connection, to thereby allow TCP acknowledgement, wherein said first address translation means translates a destination address of a first TCP packet received from said source host to said edge router to an address of said edge router, and forwards said first TCP packet to said means for terminating a TCP connection, wherein said means for terminating a TCP connection generates a packet for acknowledgement responsive to reception of the first TCP packet and forwards the packet for acknowledgement to said first address translation means, and said first address translation means translates a source address of said packet for acknowledgement from a source-side edge address of said means for terminating a TCP connection to an address of the destination host and forwards the translated packet for acknowledgement to said source host, and wherein said means for terminating a TCP connection modifies and forwards said first TCP packet to said second address translation means, and said second address translation means translates a source address of said first TCP packet received from said means for terminating a TCP connection, into an address of said source host, and forwards the translated first TCP packet to the destination host.