3Com OfficeConnect 3C840, Руководство пользователя

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12-12 C
HAPTER
12: C
ONFIGURING
F
ILTERS
Step-by-Step Guide
to Creating Filters
Using the
OfficeConnect
Remote 840
Manager
Filters can be tricky to define so spend time before accessing the screens
thinking about what you want the filter to do.
First determine which direction and location of the data path you want to
apply the filter to: for example, do you want to filter packets as they enter
from the Ethernet ports, or as they go to all of the Remote Sites, or as
they exit to go to a specific Remote Site?
Next, think about the desired results of the filtering, that is, which data
packets are to be removed from the traffic (ex: if bridging, perhaps all IPX
packets, or if routing IP, maybe all packets from a specific machine or
group of machines.)
For more information on designing filters, see “Filtering Overview” .
1 Go to Configuration > Global > Filters . Select Create/Modify Filters .
On the Create/Modify screen, select the direction/location of the data
traffic where the filter will be activated. Press the Next button to bring up
the Filter Summary screen for this direction/location.
2 On the Filter Summary screen, press the Create button to bring up the
Filter Action screen.
3 On the Filter Action screen, enter a name for the filter and select the
desired protocol. Then press the Next button to bring up the appropriate
protocol condition screen.
4 On the protocol condition screen, select the action of the filter (discard or
forward packet) and the first condition sentence for your filter.
5 Use the pull down boxes as needed to create your filter by selecting
keywords (such as IP Destination Address / IP Source Address) and
operations (is Equal to / is Not Equal to).
6 Then enter the value to be filtered against, that is, the IP address, Port
number, etc. that finishes the condition information needed for the filter.
Then press the
Next button to see the Condition Summary screen.
From the Condition Summary screen, add more conditions as needed
by selecting a condition number and pressing the Add button. This takes
you back to the protocol condition screen.
This screen is the same as for the first condition except that now you can
choose to logically “And” or “Or” this new condition to the previous
condition.
840ug.book Page 12 Friday, July 7, 2000 2:23 PM