Справочное Руководство для Netopia r7100-c

By matching on a por t number, a filter can be applied to selected TCP or UDP ser vices, such as Telnet, FTP, and 
World Wide Web. The tables below show a few common ser vices and their associated por t numbers.

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.

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 pass (for ward) packets or to block (discard) packets

TFTP

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who

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