Patent ID: 6671734
Filing Date: 2003-12-30
Classification: G06F,H04L,H04W

Abstract:
An IP fragment-processing apparatus comprising:a first register which receives predetermined bytes of an IP header of an original IP packet; a second register which receives predetermined bytes of the IP header of a packet which is obtained by dividing said original IP packet; a third register which receives first and second portions of the IP header of said original IP packet; a first arithmetic unit which subtracts third, fourth and fifth portions of said predetermined bytes received in said second register from a third portion of said predetermined bytes received in said first register; a second arithmetic unit which subtracts a predetermined value from said first portion and recalculates the second portion corresponding to a change of said first portion; and a third arithmetic unit which generates a new second portion by adding a result of an arithmetic operation of said first arithmetic unit and the second portion obtained by said second arithmetic unit to each other.