I have not had any trouble with WEP, either with the DLink dir-615 or the 3com Office Connect ASDL router.
I cannot connect to the latter using WPA-PSK TKIP - a known problem for which MS will not do anything, despite the model being on their compatibility list.
If you want to know what encryption modes your wireless adapter driver supports, from a command prompt, type:
Code:
netsh wlan show all
and the first section of the output - show drivers - outlines which modes are available to you:
Code:
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2010 Microsoft Corporation. All rights reserved.
C:\Windows\system32>netsh wlan show all
Wireless System Information Summary
(Time: 04/08/2011 09:45:16 GMT Daylight Time)
=======================================================================
============================== SHOW DRIVERS ===========================
=======================================================================
Interface name: Wireless Network Connection
Driver : Atheros AR5007EG Wireless Network Adapter
Vendor : Atheros Communications Inc.
Provider : Microsoft
Date : 09/06/2009
Version : 2.0.0.74
INF file : C:\Windows\INF\netathr.inf
Files : 1 total
C:\Windows\system32\DRIVERS\athr.sys
Type : Native Wi-Fi Driver
Radio types supported : 802.11b 802.11g
FIPS 140-2 mode supported : Yes
Hosted network supported : Yes
Authentication and cipher supported in infrastructure mode:
Open None
Open WEP-40bit
Shared WEP-40bit
Open WEP-104bit
Shared WEP-104bit
Open WEP
Shared WEP
WPA-Enterprise TKIP
WPA-Personal TKIP
WPA2-Enterprise TKIP
WPA2-Personal TKIP
Vendor defined TKIP
WPA2-Enterprise Vendor defined
Vendor defined Vendor defined
WPA-Enterprise CCMP
WPA-Personal CCMP
WPA2-Enterprise CCMP
Vendor defined CCMP
WPA2-Enterprise Vendor defined
Vendor defined Vendor defined
WPA2-Personal CCMP
Authentication and cipher supported in ad-hoc mode:
Open None
Open WEP-40bit
Open WEP-104bit
Open WEP
WPA2-Personal CCMP
in
Control Panel\All Control Panel Items\Network and Sharing Center\Advanced sharing settings
you may need to reduce the file sharing connection encryption from 128-bit to 40- to 56-bit.
This also often speeds the network up as does disabling the homegroup and disabling IPv6, and the associated link-layer topology discovery. 12% faster network transfers have been reported by doing this.