Справочник Пользователя для Netopia R2020

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

Internet service

TCP port

Internet service

TCP port

FTP

20/21

Finger

79

Telnet

23

World Wide Web

80

SMTP (mail)

25

News

144

Gopher

70

rlogin

513

Internet service

UDP port

Internet service

UDP port

Who Is

43

AppleTalk Routing 
Maintenance (at-r tmp)

202

World Wide Web

80

AppleTalk Name Binding 
(at-nbp)

202

SNMP

161

AURP (AppleTalk)

387

TFTP

69

who

513