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Suprise, another Ethernet problem post!!

Last response: in Networking
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August 24, 2012 4:34:37 PM

I'm having trouble with my ethernet connection. My modem and router are both working properly. I say this because my wife has no trouble accessing the internet on her laptop ( the device that I'm typing on right now), nor do we have an issue with either of our android phones. So I think my wireless router is ok. Also, I've hooked up her laptop directly to the modem via a wired connection and no problem there either. The issue I have is with my PC, after boot up, I get the "yellow triangle" saying "no internet access." I open the Network and Sharing Center and let Windows 7 diagnose the problem and I get one of two messages,

#1) The connection between your access point, router, or cable modem and the Internet is broken.
OR
#2) The DNS server isn't responding.

So, having read several posts on this site from folks having similar problems, I have downloaded Malwarebytes and Kapersky TDSSKiller and ran them both. Neither of them detected an issue. I even thought that I may have been being paranoid about having a virus causing the problem so I bought a 20 dollar ethernet card and installed it (thinking that my onboard Mobo port my have died) and still have the same issue.

I'm at a point now where I'm not sure what to do. I know I'm probably overthinking it and making it worse than it is, thus making the simple solution elude me.

Anyway, for those who read this and have a suggestion. Thank you.
August 24, 2012 4:48:09 PM

Let's see the TCP/IP configuration on that troublesome computer when it's connected but not working.

Hit Windows key + R, copy/paste the following into the box, and hit enter.

cmd /c "ipconfig /all > %tmp%\tmp.txt && start notepad %tmp%\tmp.txt"

This will open a file detailing your network configuration. Cut and paste the contents to this forum.
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August 24, 2012 5:04:03 PM


Windows IP Configuration

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

Ethernet adapter Local Area Connection 3:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : D-Link DFE-530TX+ PCI Fast Ethernet Adapter (rev.F)
Physical Address. . . . . . . . . : FC-75-16-E3-48-DB
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::D 010:7b01:8120:27eb%17(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.6(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Friday, August 24, 2012 12:22:06 PM
Lease Expires . . . . . . . . . . : Saturday, August 25, 2012 12:22:06 PM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 570193174
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-12-D7-CA-14-90-E6-BA-07-37-CF
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{6BC0E45B-96F2-40FC-84D6-41A8E8925BF0}:

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
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August 24, 2012 5:08:09 PM

Looks completely normal. Now do the same thing w/ one of the other working computers so we can compare them.
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August 24, 2012 5:20:44 PM

These are the results from my wife's laptop.


Windows IP Configuration

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

Wireless LAN adapter Wireless Network Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Atheros AR5B97 Wireless Network Adapter
Physical Address. . . . . . . . . : 1C-65-9D-09-27-00
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::80bb:c5db:385b:17fe%12(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.4(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, August 23, 2012 11:07:10 PM
Lease Expires . . . . . . . . . . : Saturday, August 25, 2012 11:35:50 AM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 320628125
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-F2-6B-22-60-EB-69-0E-B1-D8
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : domain.invalid
Description . . . . . . . . . . . : Atheros AR8131 PCI-E Gigabit Ethernet Controller (NDIS 6.20)
Physical Address. . . . . . . . . : 60-EB-69-0E-B1-D8
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{3ED92C30-8524-49D1-8182-9A94FAF05BBC}:

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 Local Area Connection* 11:

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 isatap.domain.invalid:

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 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. . . . . . . . . . . : 2001:0:9d38:953c:c61:2f08:3f57:fefb(Preferred)
Link-local IPv6 Address . . . . . : fe80::c61:2f08:3f57:fefb%13(Preferred)
Default Gateway . . . . . . . . . : ::
NetBIOS over Tcpip. . . . . . . . : Disabled
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August 24, 2012 5:36:18 PM

That looks completely normal too.

You said the laptop works over wire, but you only tested that when connected directly to the modem. Try the laptop connected to the *router* over wire so we can see if this affects EVERY wired device to the router, or only Gavin-PC (in fact, use the same cable and same port on the router too).
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August 24, 2012 5:48:36 PM

Ok, I unplugged the cable from my PC and I'm running on the same one to the laptop now. So it seems that the router isn't the issue, and the ethernet cable isn't the culprit either. I did forget to mention that I tried all four ports on the router in my original post, all with the same result.

Just want to say also, thanks a ton for the help man. I've been fighting this for a couple of days and my brain is a bit fried.
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August 25, 2012 2:29:30 AM

Just turned on my PC to beat my head against the keyboard some more and for whatever reason, I have internet access again. So on the positive side, I have access for now. On the other hand, it looks like I have an intermittent problem... and those are always a pain to troubleshoot.
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!