Protocol Analyzer
Building a Filter
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● Filter on data anywhere within the packet, not just on the packet
headers.
● Match packets that can’t be decoded.
● Filter packets at the bit level.
A pattern match element compares a sequence of up to 32 bytes at a
specified offset in the packet to a pattern of the same length. For further
flexibility, you can apply a mask to the packet before the pattern compar-
ison is performed.
When you select Filter➤Pattern…, a window like the one shown in
figure 78 on page 373 appears. This window lets you specify the criteria
for the pattern to match.
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