Laptop connects to wired LAN, but no internet?

[klimcan]

My laptop can make a wired ethernet connection, but once it does, I can't connect to the internet. Also, the taskbar icon (for LAN connections, showing two computers) shows only one blinking computer, the other one is "dark". My firewall (Comodo) only shows a green arrow indicating traffic up, but no arrow showing traffic down.

I've turned off all firewalls, tried different cables and different networks, but my laptop still shows the same symptoms. Wi-fi and dialup connections work fine, and the NIC (Realtek RTL8139/810x Family) is reported as working in device manager. The physical lights on the ethernet port light up when a cable is connected. I've had this problem before, and gently scrubbing the ethernet port connectors with a pencil eraser used to work, but it doesn't anymore. Thanks in advance for any help!

C:\Documents and Settings\xxx>ipconfig
Windows IP Configuration


Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.0.1
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :

Ethernet adapter Wireless Network Connection 2:

Media State . . . . . . . . . . . : Media disconnected

C:\Documents and Settings\xxx>ipconfig/renew

Windows IP Configuration

No operation can be performed on Wireless Network Connection 2 while it has its
media disconnected.

C:\Documents and Settings\xxx>ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : PC116878316169
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Mixed
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8139/810x Family Fast Ethernet NIC
Physical Address. . . . . . . . . : 00-C0-9F-87-CC-59
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 192.168.0.1
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :

Ethernet adapter Wireless Network Connection 2:

Media State . . . . . . . . . . . : Media disconnected
Description . . . . . . . . . . . : Broadcom 802.11b/g WLAN
Physical Address. . . . . . . . . : 00-90-4B-A9-3A-D8

[Sleestak]

Make sure Local Area Connection is set to obtain the IP address and DNS automatically.

[klimcan]

That solved it! I don't know how my settings got changed, but a million thanks!