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Network down, can't find problem

Last response: in Networking
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June 25, 2010 3:20:09 PM

Hi guys! I'm having internet problems that I have tried to fix for two days now and just can't get anywhere with. I have tried everything I can think of and every forum I can find and nothing has helped. I'm hoping the experts at Tom's can help.

First a rundown of my system:

I have a Comcast Cable modem that is plugged into a Gigabit DIR-655 Router. From the Router, I have two, sometimes three, laptops connecting wireless and then my PS3 and computer connected by a wire. My computer is running legal Windows 7 with everything updated.

About two days ago, when I got home from work, my internet was down. Every once in a while this happens so I proceeded to restart my router. That didn't fix it and so I went from there and it just got worse. Here is a list of everything I've checked.

Reset/Restarted Router
Reset/Restarted Modem
Checked that I had the newest NIC driver and the newest firmware on router
Made sure that all the laptops and PS3 have connection (They do)
Tried to restart computer.
Tried booting into Ubuntu to see if I could get internet there (I CAN'T)
Tried uninstalling the Network adapter driver and reinstalling it
Tried pinging the NIC (270.0.0.1) It pings fine
I have tried plugging the ethernet wire that was going into my pc into my ps3 and one of the laptops (It connects both of them)

What happens when I first boot into Windows is that it says I don't have a network. The little diagram just shows the adapter going into internet. When I unplug the ethernet cord from the back of the computer and plug it right back in, then it shows a network but an unidentified public network.

I'm so confused by this because I've pretty much killed of the possiblity of a hardware problem but at the same time since it is happening in Ubuntu and Windows 7, it doesn't seem like it could be a software problem. Maybe it conveniently has a software problem with both? Any help would be greatly appreciated. I don't have a ipconfig /all log yet since I'm at work. I'll try to post one this afternoon.

More about : network find problem

June 25, 2010 3:49:03 PM

So it's just the win 7 PC that doesn't have internet? Can I assume it doesn't have any network connection at all? Other devices (wireless laptop) do have an internet/network connection?
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June 25, 2010 3:58:23 PM

Correct. It is just the hardwired Win 7 PC. All the other PC's and PS3 still have internet. Also, I don't know if this is helpful but it seems strange to me. When I first boot into Windows, the Network Sharing Center diagram shows my adapter going straight into the Internet and there is red x on the Internet. When I pull the ethernet cord and plug it back in then it comes up that their is a network but it is an unidentified public one.
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June 25, 2010 4:21:32 PM

If you have a problem w/2 different OSs on the same PC, I'd think it could still be a hardware problem. The adapter itself could be bad. Is it built into the MB?
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June 25, 2010 4:26:16 PM

Yes. It is built into the Mobo. It is a Realtek. However, since I pinged it and it didn't have a problem, doesn't that mean it is good? Thanks.
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June 25, 2010 5:21:23 PM

Windows IP Configuration

Host Name . . . . . . . . . . . . : Jenny_2
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Peer-Peer
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : 6C-F0-49-05-46-67
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{3C421BC8-01B5-4F55-BF1E-F2C2FF163B44}:

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


This is my Ipconifg /all log
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June 25, 2010 6:31:52 PM

kamikazimunkey said:
Yes. It is built into the Mobo. It is a Realtek. However, since I pinged it and it didn't have a problem, doesn't that mean it is good? Thanks.


Not 100% sure that's the case. Do you have a link light on the adapter? Does it show activity?
Could be worth a call / email to the MB vendor.
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June 25, 2010 7:39:36 PM

I haven't looked but I will check when I get home and post an update.
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!