Programmable Filtering
Orbitor 3000 Reference Manual— B-5
This will cause the MAC Address Filters specified to be used for forwarding frames with the specified
MAC addresses.
5
From the MAC ADDRESS FILTERS MENU, enter a 1.
This will place you at the first EDIT MAC ADDRESS FILTER MENU screen.
At the prompt enter the MAC address for which you want to specify the filter.
6
Enter the 12-digit Ethernet address of the host system in the following format: 000001020304 (enter a
Return)
The edit screen will fill in the information that the table knows about this address. For this example, let
us assume that it knows that the address is “present” and located on the LAN of the partner bridge/router.
7
Enter a 4 to Enable the “Forward if Destination” parameter. The edit screen will be updated to show the
new information.
At this point, the address is added to the permanent filter table of the local LAN. This entry, therefore, will not
be subject to the aging timer, and will remain active until it is removed from the permanent entry table.
When a frame of information is seen on the local LAN that contains the address of the host system in the
destination field of the frame, the bridge/router will forward it. All other frames seen on the local LAN that are
destined for the remote LAN will be filtered.
Security—“Forward if Source”
Forward if Source is a function that allows you to forward an Ethernet frame if the source address of the frame
equals the address that the Forward if Source function has been applied to.
Example:
Assume that a Personal Computer is located on segment 1 on the local bridge/router. This station belongs to the
head of Marketing. This station requires access to all the services that exist on the remote LAN but no other
station on the local LAN is allowed to access the remote LAN. This can be easily accomplished with a “Forward
if Source.”
The Ethernet Address for this Personal Computer is:
01-02-03-04-05-06
Again, this address uniquely identifies this computer station.
To configure the bridge/router to ensure that only this station is able to access facilities on a remote LAN
segment, follow the instructions below:
1
From the MAIN MENU of the console of the local bridge/router, enter a 1.
(Enter a “=“ from any menu to go back to the MAIN MENU.)
This will place you at the CONFIGURATION MENU, where access to the filtering menu is obtained.
2
From the CONFIGURATION MENU, enter an 8.
This will place you at the FILTER SET-UP MENU, where access to the individual filtering menus is
obtained.
