Introduction to Filtering
66
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.
Summary of Contents for PERLE P850
Page 6: ......
Page 21: ...Installation 15 Figure 1 4 Front View of the P850 router Tx Rx Power ...
Page 83: ...Octet Locations on Ethernet Frames 77 Octet Locations on a Bridged XNS Frame ...
Page 101: ...Servicing Information 95 ...
Page 106: ...100 Router A PC used for TFTP transfers Link 1 Link 2 Router B Router C ...