For years I've used a physical Ethernet connection for my internet access, then a few days ago it went down and said it was an unidentified network with no internet access. I dug out a wifi card and plugged that in and it works (not ideal due to the distance from the router but it connects). The other computers connected via wifi/cable all work as well.
I've uninstalled and reinstalled the network card, updated drivers, reset the TCP/IP stack, released and renewed the IP address, enabled DHCP, checked the firewall settings, removed and reinstalled antivirus, manually set the IP and default gateway, still nothing…
When you run the diagnose feature within Windows it returns: "Ethernet 2" doesn't have a valid IP configuration. Not fixed.
Output from ipconfig /all:
Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.
C:\WINDOWS\system32>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : Work
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Ethernet 2:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 PL Network Connection #
2
Physical Address. . . . . . . . . : 00-00-00-00-00-00
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::b534:b0b3:ad1:1da2%18(Preferred)
Autoconfiguration IPv4 Address. . : 169.254.29.162(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 301989888
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-18-93-FE-F2-00-16-76-AA-A3-75
DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1
NetBIOS over Tcpip. . . . . . . . : Enabled
Wireless LAN adapter Local Area Connection* 11:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Hosted Network Virtual Adapter
Physical Address. . . . . . . . . : 00-02-72-91-16-16
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter Wi-Fi:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek RTL8188SU Wireless LAN 802.11n US
B 2.0 Network Adapter
Physical Address. . . . . . . . . : 00-02-72-91-16-16
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::d1:2c7f:28a0:1ce4%15(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.10(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Saturday, August 2, 2014 6:21:12 PM
Lease Expires . . . . . . . . . . : Sunday, August 3, 2014 7:08:43 PM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 301990514
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-18-93-FE-F2-00-16-76-AA-A3-75
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter isatap.{0F0A1572-FE9D-4F61-8D41-CB325F939144}:
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 isatap.{C1FE707E-1751-4EF3-8FEF-7E9988AA0333}:
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
Results from netstat -e (Cable unplugged, wifi off):
Interface Statistics
Received Sent
Bytes 1358924 1405148
Unicast packets 3 13
Non-unicast packets 14624 15280
Discards 0 0
Errors 0 0
Unknown protocols 0
Results from netstat -e (Cable plugged in, wifi off):
Interface Statistics
Received Sent
Bytes 1358924 1498552
Unicast packets 3 13
Non-unicast packets 14624 16224
Discards 0 0
Errors 0 0
Unknown protocols 0
Best Answer
I think the problem here could be with MAC address (physical address), here in your screenshots is showing zeros. Try to see if that is changed in properties for your Intel lan card, maybe some values are changed they should be on default-factory value.
Also you can try to manually change MAC address. First three fields in MAC address represent the vendor of the network card, search for it and find some physical address number. You can also look for some free app for network card manipulation.