Patent ID: 8875275

Claim:
A rule verification apparatus for examining a change in traffic due to a difference between rules for controlling traffic, the verification apparatus comprising: a processor and a memory, the memory embodying instructions that when executed by the processor cause the processor to execute a procedure, the procedure comprising: obtaining a first group of first frames obtained by applying a first rule to a flow of traffic corresponding to a transaction; obtaining a second group of second frames obtained by applying a second rule to the flow; referring to the first group and the second group obtained by said obtaining; monitoring starts and ends of each of the flows to which each of the first and second rules is applied; holding the first frames included in the first group and the second frames included in the second group obtained by said obtaining; comparing the first frames and the second frames held by said holding, when said monitoring detects both the end of the flow in the first group and the end of the flow in the second group; and discarding both the first frames in the first group and the second frames in the second group held by said holding only when the first frames and the second frames held by said holding coincide with each other, based on a result of the comparing on each detecting of both the end of the flow in the first group and the end of the flow in the second group.