Netgear RM356 RM356 Reference Manual - Page 87

Implementing the Filter, The Filter Set Configuration Menu is shown

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Reference Guide for the Model RM356 Modem Router Implementing the Filter Now you can proceed to define a call filter to block the three NetBIOS service ports. The Filter Set Configuration Menu is shown in Figure 8-3. To define a call filter: 1. Go to Menu 21 - Filter Set Configuration, and choose a name and filter set. Menu 21 - Filter Set Configuration Filter Set # ------ 1 2 3 4 5 6 Comments netbios Filter Set # ------ 7 8 9 10 11 12 Comments Enter Filter Set Number to Configure= 1 Edit Comments= netbios Press ENTER to Confirm or ESC to Cancel: Figure 8-3. Menu 21 Filter Set Configuration 2. Next, define the filter rules. You want your filter to ignore (drop) UDP and TCP packets originating from ports 137, 138, and 139. Because each protocol/port combination must be specified as a separate rule, there will be six rules. Each filter set contains six rules, so you will fill one entire set. Begin with rule 1, as illustrated in Figure 8-3. Filter Configuration 8-11

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Reference Guide for the Model RM356 Modem Router
Filter Configuration
8-11
Implementing the Filter
Now you can proceed to define a call filter to block the three NetBIOS service ports.
The Filter Set Configuration Menu is shown in Figure 8-3.
To define a call filter:
1.
Go to Menu 21 - Filter Set Configuration, and choose a name and filter set.
Figure 8-3.
Menu 21 Filter Set Configuration
2.
Next, define the filter rules.
You want your filter to ignore (drop) UDP and TCP packets originating from ports 137, 138,
and 139. Because each protocol/port combination must be specified as a separate rule, there
will be six rules. Each filter set contains six rules, so you will fill one entire set. Begin with
rule 1, as illustrated in
Figure 8-3
.
Menu 21 - Filter Set Configuration
Filter
Filter
Set #
Comments
Set #
Comments
------
-----------------
------
-----------------
1
netbios
7
_______________
2
_______________
8
_______________
3
_______________
9
_______________
4
_______________
10
_______________
5
_______________
11
_______________
6
_______________
12
_______________
Enter Filter Set Number to Configure= 1
Edit Comments= netbios
Press ENTER to Confirm or ESC to Cancel: