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Hi, I too have a problem. I upgraded my modem to 20mb from 2mb. My download/speed are very low. On speedtest, it says I reached around 1,200 KB down and 400 up (which is of course low) also when I try to download a file from a reliable server, I get 90k/sec...

I'm using a wireless router with WEP. Laptop and my PC are affected, laptop is WinXP and PC is Vista ulimate 64 bit. The modem is old, I think because the boardband used to be NTL but now it got changed to a new company - Virgin Media, obviously they now offer a different look modem. But odd thing is before I upgraded, my speed was fine as normal.

the router is Belkin

By the way, I'm not using a router at the moment. I just plugged the eternet cable to my PC from modem, thats it.
Here's the log of ipconfig in Vista:

C:\Users\Mark>IPCONFIG/ALL

Windows IP Configuration

Host Name . . . . . . . . . . . . : Mark-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8168/8111 Family PCI-E Gigabit
Ethernet NIC (NDIS 6.0)
Physical Address. . . . . . . . . : 00-19-66-46-EB-C1
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::1cb:1ee0:cf95:8c98%8(Preferred)
IPv4 Address. . . . . . . . . . . : 86.20.19.191(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.252.0
Lease Obtained. . . . . . . . . . : 25 November 2007 22:17:46
Lease Expires . . . . . . . . . . : 01 December 2007 17:52:40
Default Gateway . . . . . . . . . : 86.20.16.1
DHCP Server . . . . . . . . . . . : 62.255.32.21
DHCPv6 IAID . . . . . . . . . . . : 201333094
DNS Servers . . . . . . . . . . . : 194.168.4.100
194.168.8.100
NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter Local Area Connection* 6:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 02-00-54-55-4E-01
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:4136:e38c:80f:1410:a9eb:ec40(Prefe
rred)
Link-local IPv6 Address . . . . . : fe80::80f:1410:a9eb:ec40%9(Preferred)
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter Local Area Connection* 7:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 6TO4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Temporary IPv6 Address. . . . . . : 2002:5614:13bf::5614:13bf(Preferred)
Default Gateway . . . . . . . . . : 2002:c058:6301::c058:6301
DNS Servers . . . . . . . . . . . : 194.168.4.100
194.168.8.100
NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter Local Area Connection* 9:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.{49099711-C4A4-4C32-805F-63077C5E8
041}
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::200:5efe:86.20.19.191%10(Preferred)

Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 194.168.4.100
194.168.8.100
NetBIOS over Tcpip. . . . . . . . : Disabled

C:\Users\Mark>

Why so many Tunnel adapters?

EDIT: Ok, I tried to disable IPv6 (Tunnel adapters), I restareded and IPCONFIG'd again and Tunnel still shows up but it says media disconnected under Tunnel adapater. Didn't work still, I even got slower speed by disabling IPv6.