| 摘要 |
This invention relates to a method and apparatus for filtering network packets. The method comprises a method of filtering a packet in a packet switched network in which two complementary packets are transmitted in opposite directions between a particular source and a particular destination comprising the steps of: a) selecting a complementary portion of the source and destination address of said packet; b) performing a commutative operation on said complementary portion; and c) processing or discarding the packet in dependence upon the results of said commutative operation.
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