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
Putting the parts together
When you display a filter set, its filters are displayed as rows in a table:
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
TFTP
69
World Wide Web
80
who
513
SNMP
161
Internet service
TCP port
Internet service
TCP port
Summary of Contents for Netopia Embedded Software
Page 10: ...x Administrator s Handbook ...
Page 16: ...1 6 Administrator s Handbook ...
Page 44: ...2 28 Administrator s Handbook ...
Page 108: ...3 64 Administrator s Handbook ...
Page 176: ...5 34 Administrator s Handbook ...
Page 202: ...6 26 Administrator s Handbook ...
Page 244: ...7 42 Administrator s Handbook ...
Page 340: ...Index 6 ...