System and method for filtering a data packet using a common filter
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United States of America Patent
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Nov 22, 2011
Grant Date -
Oct 28, 2010
app pub date -
Apr 22, 2009
filing date -
Apr 22, 2009
priority date (Note) -
Expired
status (Latency Note)
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Abstract
System and method for filtering a data packet using a combined filter are disclosed. In one aspect, the method includes receiving a data packet and N filters each comprising a mask and value. The method includes receiving a data packet and N (wherein N is an integer and N>1) filters, each filter comprising a bit mask and corresponding bit values. The method further includes generating a common filter mask and the corresponding bit values by taking the overlapping mask bits among portions of the N filters corresponding to the common filter, the common filter being of a length smaller than each filter. The method further includes applying the common filter mask to the data packet to determine whether there is a match between the filtered data packet and each of the N filters.
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