Windows 7: LAN connection doesn't work in some laptops

Hi. My room mates and i recently got an internet connection. Unfortunately, we only have one LAN cable so we need to take turn in using it. It works fine on my netbook but not to them. Windows troubleshoot it and says "Local Area Connection doesn't have a valid IP configuration". What should we do?



P.S. At first, i also can't connect via LAN but i windows troubleshoot it, says DHCP was disabled so i enabled it. Then tadaaaa! I'm connected to the internet.

This is most likely because your connection is only using a modem instead of a router. Modem's only support a single machine and are tied into the mac address of that machine. If you need more connections you need a router connected to the modem.

yep, we're using a modem. so, even it has 4 LAN ports, i could only use one?

by the way, i was able to fix the connection problem with my room mate's netbook. it was the same case as mine(disabled DHCP). so now, it's working on two netbooks but not on my other room mate's laptop. i feel bad he can't use the internet.

In that case it's a modem/router which should work fine.

I'm not sure why DHCP would be disabled on those laptops because by default it should be enabled.

On the laptop with the problem, make sure DHCP is enabled then go to the Network and Sharing center, then look left side to "Manage Wireless Connections" and set up a profile for the wireless connection.

Make sure the type of Security and Encryption are the same as the modem/router is using, then just type in the SSID and password.

DHCP is enabled in the laptop. I've set up an ad hoc wifi. The laptop can connect but there's no internet access. Both Local Area Connection and Wireless Area Connection doesn't have a valid IP configuration.

Who is your service provider.

1, BT goto 192.168.0.254
2, Virgin Goto 192.168.0.1
3, Others goto 192.168.1.1 or Virgin's.

Open it and enter admin for user and the password is on the rear of the modem.

Once there FIND Modem mode and disable. This will enable your LAN cables too work. And maybe Wifi.

Why would you need to set up an AdHoc if you already have a wireless router?

Can I see the ipconfig/all from this laptop?

-uhm. i'm not sure if it's a wireless router. our modem looks like this:
http://cdn.sulitstatic.com/images/20...fee6f01082.jpg

-and this is the ipconfig of the laptop that can't conect:

this is the ipconfig of the laptop:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\Josh>ipconfig/all

Windows IP Configuration

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

Wireless LAN adapter Wireless Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8187 Wireless 802.11b/g 54Mbps
USB 2.0 Network Adapter
Physical Address. . . . . . . . . : 00-15-AF-32-99-23
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : VIA Rhine II Compatible Fast Ethernet Ada
pter
Physical Address. . . . . . . . . : 00-90-F5-62-1D-AE
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::85b2:e646:f63f:1e20%11(Preferred)
Autoconfiguration IPv4 Address. . : 169.254.30.32(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . : 0.0.0.0
DHCPv6 IAID . . . . . . . . . . . : 234918133
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-A6-A5-25-00-90-F5-62-1D-AE

DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{E1E9E82C-1CCB-4823-B20B-81ED83E6227F}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{5A919AE5-7BE7-4A4F-9958-A24C25EA40E8}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes



-and this would be the ipconfig of my netbook:
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\ven>ipconfig/all

Windows IP Configuration

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

Wireless LAN adapter Wireless Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Atheros AR5B95 Wireless Network Adapter
Physical Address. . . . . . . . . : D0-DF-9A-AA-48-0A
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Atheros AR8152 PCI-E Fast Ethernet Contro
ller (NDIS 6.20)
Physical Address. . . . . . . . . : B8-70-F4-ED-1E-82
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::88c2:72eb:a9bc:f67c%14(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.3(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Sunday, October 14, 2012 5:41:06 AM
Lease Expires . . . . . . . . . . : Wednesday, October 17, 2012 6:20:58 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 397963508
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-16-0F-30-50-D0-DF-9A-AA-48-0A

DNS Servers . . . . . . . . . . . : 192.168.1.1
192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{BF86536D-C6CA-44EA-B39D-ED2CDE1A4DD1}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:9d38:6ab8:1873:c641:83f9:4a2c(Pref
erred)
Link-local IPv6 Address . . . . . : fe80::1873:c641:83f9:4a2c%11(Preferred)
Default Gateway . . . . . . . . . : ::
NetBIOS over Tcpip. . . . . . . . : Disabled

Tunnel adapter Local Area Connection* 16:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter #8
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{074B2E5B-BB65-4017-AC8D-176C57085A9A}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 11:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter #3
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter 6TO4 Adapter:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Reusable Microsoft 6To4 Adapter:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 12:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter #4
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 13:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter #5
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 14:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter #6
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 15:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter #7
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

C:\Users\ven>

From the IP address showing you do have a modem/router, the netbook appears to be connected to Ethernet while the laptop appears to be trying to connect through Ethernet but isn't receiving a valid IP.

On the laptop with the problem try saving the file below, unzip and run the file on that machine until it reboots then try to connect again.