Unwanted Connections Under Windows Xp; Cable Testing - Lancom DSL Series Manual

LANCOM Wireless DSL – LANCOM Wireless ADSL
Chapter 10: Troubleshooting
Numerous other factors involving the Internet itself can also influence the
transfer rate.
Increasing the TCP/IP window size under Windows
If the actual transfer rate of a DSL connection is significantly below the fastest
rate listed by the provider, there are only a few possible causes (apart from the
above-mentioned external factors) which may involve one's own equipment.
One common problem occurs when large amounts of data are sent and
received simultaneously with a Windows PC using an asynchronous connec-
tion. This can cause a severe decrease in download speed. The cause of this
problem is what is known as the TCP/IP receive window size of the Windows
operating system that is set to a value too small for asynchronous connec-
tions.
Instructions on how to increase the Windows size can be found in the Knowl-
edge Base of the support section of the LANCOM web site (www.lancom.de).
10.3

Unwanted connections under Windows XP

Windows XP computers attempt to compare their clocks with a timeserver on
the Internet at start-up. This is why when a Windows XP in the WLAN is
started, a connection to the Internet is established by the LANCOM.
To resolve this issue, you can turn off the automatic time synchronization on
the Windows XP computers under Right mouse click on the time of day
Properties
10.4

Cable testing

A cabling defect might have occurred, if no data is transmitted over LAN or
WAN connection, although the configuration of the devices does not show
any discernible errors.
You can test the cabling with the built-in cable tester of your LANCOM.
Change under WEBconfig to menu item Expert configuration
LAN statistics
84
Internet time.
Cable test. Enter here the name of the interface to be
Status