Netopia R310 Benutzerhandbuch
Security 12-17
10. Select ICMP Code Compare and choose one of the following options from the pop-up menu: No Compare,
Not Equal To, Less Than, Less Than or Equal, Equal, Greater Than or Equal, or Greater Than.
11. In addition to the Type, an 8-bit field, Code, gives more information about the Type. Select ICMP Codes and
select more information about the type. The choices are:
It is unlikely that you would need to filter on ICMP code types. However, if you should find it necessar y, refer
to standard texts on internetworking with TCP/IP for more information.
to standard texts on internetworking with TCP/IP for more information.
12. If the Protocol Type is TCP or UDP, select Source Port Compare and choose a comparison method for the
filter to use on a packet’s source por t number. Then select Source Port ID and enter the actual source
por t number to match on (see the table on
por t number to match on (see the table on
).
Note: If the Protocol Type is ICMP, you will not see this field.
13. Select Dest. Port Compare and choose a comparison method for the filter to use on a packet’s destination
por t number. Then select Dest. Port ID and enter the actual destination por t number to match on (see the
table on
table on
Note: If the Protocol Type is ICMP, you will not see this field.
14. When you are finished configuring the filter, select ADD THIS FILTER NOW to save the filter in the filter set.
Select CANCEL to discard the filter.
Viewing filters
To display a view-only table of input (output) filters, select Display/Change Input Filters (Display/Change
Output Filters) in the Add IP Filter Set screen.
Output Filters) in the Add IP Filter Set screen.
Type
Description
0
Echo reply
3
Destination unreachable
8
Echo request
Code
Description
0
Network Unreachable
1
Host unreachable
6
Destination network unknown
7
Destination host unknown