Reducing Unnecessary Calls By Windows 95; Diagnosing The Situation; Figure 8-2. Lan Packet Which Triggered Last Call - NETGEAR RH348 Reference Manual

Reducing Unnecessary Calls by Windows 95

One example of when to apply a filter set is reducing unnecessary calls by Windows
using Windows 95 with a dial-up ISDN router, you may need to make some configuration changes
to avoid having ISDN calls placed unnecessarily. Most of these unnecessary calls are caused by
PCs on the LAN trying to perform local NetBIOS name resolution, either in response to a user
action (browsing the Network Neighborhood or turning a PC on or off, for example) or as periodic
background activity. In some cases, this NetBIOS activity can be kept local by other means, such
as configuring a WINS or DNS server on the local network, using an LMHOSTS file to store
addresses of local hosts, or turning off NetBIOS name resolution by DNS. A simpler method is to
filter NetBIOS traffic using the filtering capabilities of your Model RT328/RH348 router.

Diagnosing the Situation

If you already know the source or types of packets that are causing the problem, you can proceed
directly to the design of the filter. Otherwise, you can use a sniffer or the router's built-in tools to
determine the source. A particularly useful tool is the display in Menu 24.1 of the "LAN Packet
Which Triggered Last Call."
unwanted call to be placed.
LAN Packet Which Triggered Last Call: (Type: IP)
45 00 00 3E 9E 05 00 00 1F 11 CC 9D 8D FB 17 12 CF 45 BC B9 00 89 00 35
00 2A 63 C8 01 85 01 00 00 01 00 00 00 00 00 00 0A 53 41 4E 54 41 43 4C
Figure 8-2. LAN Packet Which Triggered Last Call
Filter Configuration
Reference Guide for the Model RT328 and Model RH348 ISDN Routers
Figure 8-2 illustrates the header of the packet that caused an
® 95. When
8-9