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Bizarre ethernet problem


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#1
Rik111

Rik111

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As indicated, I'm having a bit of an issue with my ethernet. Here's the situation:

I am a college kid, and I live in a dorm room with a roommate. My roommate has a router, which I haven't used up until this point. We are provided 2 ethernet ports into the wall. He connected his router to one of them, and I connected my laptop to the other. Things were joyous, etc.

Suddenly, upon returning from spring break, I find that I cannot connect to the internet with my ethernet cord; it says my cord is unplugged. I can do so just fine on wireless (the roommate's router). The bizarre thing is that when I unplug my ethernet cord from the wall and put it into my roommate's router-- wallah! I have ethernet-internet. I made sure my wireless was off to test this. When I'm plugged into the wall, I get a flickering between "enabled" and "a network cable is unplugged." The lights on the ethernet port flicker in time. I have tried swapping the ports on the wall AND turning the cord around. Same effect.

Edit- I have a desktop that does not have a wireless card. The ethernet-to-wall option works JUST FINE for that PC.

What could be causing this? To my knowledge, the school has not implemented any requirement for routers, and we have not changed anything. I like ethernet more than wireless because of stability, and I might find myself without a roommate at some point. Does anyone know of a fix for this?


Edit2- Here's what I did to test after browsing this forum a bit:

Windows IP Configuration

Host Name . . . . . . . . . . . . : Rik
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
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. . . . . . . . . : OMITTED (will PM to mod if needed)
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 6:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 6TO4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 7:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : isatap.{BF6E039F-8812-49D9-8155-4B5EDD4B4032}
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 . . . . . . . . . . . : 6TO4 Adapter
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 . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 02-00-54-55-4E-01
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 13:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : 6TO4 Adapter
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 . . . . . . . . . . . : 6TO4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes


Ping test:

Ping google.com
Ping request could not find host google.com. Please check the name and try again.

Ping 209.183.226.152
Pinging 209.183.226.152 with 32 bytes of data:
PING: transmit failed, error code 1231.
PING: transmit failed, error code 1231.
PING: transmit failed, error code 1231.
PING: transmit failed, error code 1231.

Ping statistics for 209.183.226.152:
Packets: Sent = 4, Received = 0, Lost = 4 (100$ loss),

Edited by Rik111, 26 March 2011 - 04:14 PM.

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#2
RKinner

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I'm thinking it's the driver on your Realtek PCIe GBE Family Controller. This is a gigabit capable NIC. Odds are that your roommate's router can't do gigabit but only 100 M, your older PC probably can't do anything but 10/100M but there's a good change that the dorm is gigabit capable and your NIC thinks it can do gigabit but isn't getting it right.

Don't know who makes your PC but I would go to their website and download the latest driver for your Realtek NIC. Then install it. There is also an optional Windows Update available for your NIC which rumor has it can cause this problem.

Other possibilities are mentioned here: http://answers.micro...b3-9fe8f6d7c2b3

If all else fails try manually setting the NIC to 100 Half. See if it works that way. There may also be options to tell the card not to use gigabit.

Ron
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#3
Rik111

Rik111

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I'm thinking it's the driver on your Realtek PCIe GBE Family Controller. This is a gigabit capable NIC. Odds are that your roommate's router can't do gigabit but only 100 M, your older PC probably can't do anything but 10/100M but there's a good change that the dorm is gigabit capable and your NIC thinks it can do gigabit but isn't getting it right.

Don't know who makes your PC but I would go to their website and download the latest driver for your Realtek NIC. Then install it. There is also an optional Windows Update available for your NIC which rumor has it can cause this problem.

Other possibilities are mentioned here: http://answers.micro...b3-9fe8f6d7c2b3

If all else fails try manually setting the NIC to 100 Half. See if it works that way. There may also be options to tell the card not to use gigabit.

Ron



Worked precisely as you said. It was the drivers. I just used the oldest ones I could find.

Thanks! :]
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