Netopia 3346N-ENT User Guide (en)

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Security   10-23
Port number comparisons
A filter can also use a comparison option to evaluate a packet’s source or destination por t number. The 
comparison options are:
No Compare: No comparison of the por t number specified in the filter with the packet’s por t number.
Not Equal To: For the filter to match, the packet’s por t number cannot equal the por t number specified in the 
filter.
Less Than: For the filter to match, the packet’s por t number must be less than the por t number specified in the 
filter.
Less Than or Equal: For the filter to match, the packet’s por t number must be less than or equal to the por t 
number specified in the filter.
Equal: For the filter to match, the packet’s por t number must equal the por t number specified in the filter.
Greater Than: For the filter to match, the packet’s por t number must be greater than the por t number specified 
in the filter.
Greater Than or Equal: For the filter to match, the packet’s por t number must be greater than or equal to the 
por t number specified in the filter.
Other filter attributes
There are three other attributes to each filter:
The filter’s order (i.e., priority) in the filter set
Whether the filter is currently active
Whether the filter is set to for ward packets or to block (discard) packets
SMTP (mail)
25
News
144
Gopher
70
rlogin
513
Internet service
UDP port
Internet service
UDP port
Who Is
43
TFTP
69
World Wide Web
80
who
513
SNMP
161
Internet service
TCP port
Internet service
TCP port