3Com 3C886 User Guide - Page 89

Evaluating Symptoms and Solutions, WORKGROUP, Control Panel, Network, Configuration, and Print Sharing

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Evaluating Symptoms and Solutions 89 Table 8 Symptoms, Causes, and Solutions Symptom Calls continue to reconnect or calls do not timeout and disconnect. Possible Cause An application or LAN device is sending IP packets. Some application software does not work properly The application may have an embedded IP address, which causes a problem when NAT is enabled on the LAN Modem. Unable to connect at 56Kbps 56K may not be supported by your remote server FCC limitations (continued) Poor line conditions Solution Enable NetBIOS filtering. To do so, access the LAN Parameters screen and click the box to enable NetBIOS filtering. When this box is checked, NetBIOS packets are prevented from initiating an outgoing call, but they will be passed if the call is already established. NetBIOS filtering is disabled by default. Set the workgroup of all attached PCs to WORKGROUP in the Network control panel. Or, turn off Microsoft's print/file sharing or use NetBEUI for local service (that is, within the LAN). To turn off print/file sharing, from Control Panel select Network and then the Configuration tab. Click the File and Print Sharing button. Clear both check boxes and then click OK. Make sure that the timeout value is not set to "0". Check the timeouts configured for the 56K LAN Modem as explained in "Changing Data Call Parameters" in Chapter 5. Drop the call via the Manual Calling screen, wait for the spurious call to be re-connected, and check the Current Call Information from the Statistics page for the Reason for call coming up. If the situation persists, disconnect each attached LAN device to locate the source of the IP packet generation. Or you can turn off Automatic Call Initiation, located on each service provider parameter page. If you have a static network, disable NAT and try the application again. A complete list of applications tested for use with the LAN Modem is located at http://www.remoteaccess.3com.com/support/d ocs/lanmodem/documentation/interop.html In order to take advantage of 56K-based analog connections, your remote server (such as an ISP) must support 56K technology. To locate a 56K-enabled ISP in your area, visit http://www.3com.com/56K. Current FCC rules restrict the power output of a Service Provider's modems, limiting download speeds to 53Kbps. Check with your telephone company to ensure maximum clarity exists for your telephone line.

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Evaluating Symptoms and Solutions
89
Calls continue to reconnect or
calls do not timeout and
disconnect.
An application or LAN device is
sending IP packets.
Enable NetBIOS filtering. To do so, access the LAN
Parameters screen and click the box to enable
NetBIOS filtering. When this box is checked, NetBIOS
packets are prevented from initiating an outgoing call,
but they will be passed if the call is already
established. NetBIOS filtering is disabled by default.
Set the workgroup of all attached PCs to
WORKGROUP
in the Network control panel.
Or, turn off Microsoft’s print/file sharing or use
NetBEUI for local service (that is, within the LAN). To
turn off print/file sharing, from
Control Panel
select
Network
and then the
Configuration
tab. Click the
File
and Print Sharing
button. Clear both check boxes and
then click
OK
.
Make sure that the timeout value is not set to “0”.
Check the timeouts configured for the 56K LAN
Modem as explained in “Changing Data Call
Parameters” in Chapter 5.
Drop the call via the Manual Calling screen, wait for
the spurious call to be re-connected, and check the
Current Call Information
from the Statistics page for
the
Reason for call coming up
.
If the situation persists, disconnect each attached
LAN device to locate the source of the IP packet
generation.
Or you can turn off Automatic Call Initiation, located
on each service provider parameter page.
Some application software
does not work properly
The application may have an
embedded IP address, which
causes a problem when NAT is
enabled on the LAN Modem.
If you have a static network, disable NAT and try the
application again.
A complete list of applications tested for use with the
LAN Modem is located at
ocs/lanmodem/documentation/interop.html
Unable to connect at 56Kbps
56K may not be supported by
your remote server
In order to take advantage of 56K-based analog
connections, your remote server (such as an ISP) must
support 56K technology. To locate a 56K-enabled ISP
in your area, visit
.
FCC limitations
Current FCC rules restrict the power output of a Service
Provider’s modems, limiting download speeds to
53Kbps.
Poor line conditions
Check with your telephone company to ensure
maximum clarity exists for your telephone line.
(continued)
Table 8
Symptoms, Causes, and Solutions
Symptom
Possible Cause
Solution