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Introduction to Filtering
59
The following operators are used in creating Pattern filters.
- offset Used in pattern filters to determine the starting
position to start the pattern checking.
Example: 12-80 This filter pattern will match
if the packet information
starting at the 12
th
octet
equals the 80 of the filter
pattern.
| OR Used in combination filters when one or the other
conditions must be met.
Example: 10-20|12-80 This filter pattern will match
if the packet information
starting at the 10
th
octet
equals the 20 of the filter
pattern or if the packet
information starting at the
12
th
octet equals the 80 of
the filter pattern.
& AND Used in combination filters when one and the other
conditions must be met.
Example: 10-20&12-80 This filter pattern will match
if the packet information
starting at the 10
th
octet
equals the 20 of the filter
pattern and the packet
information starting at the
12
th
octet equals the 80 of
the filter pattern.
~ NOT Used in pattern filters to indicate that all packets not
matching the defined pattern will be filtered.
Example: ~12-80 This filter pattern will match
if the packet information
starting at the 12th octet
does not equal the 80 of the
filter pattern.