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Ethernet problems


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#1 TheDukeDude

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Posted 13 April 2014 - 11:28 PM

So, I've been having a ton of trouble fixing my ethernet connectivity problems. Hours of searching google has given me nothing and my ISP tech support wouldn't help me. I'm hoping one of you can shed a little light on whatever I'm doing incorrectly.

So, my set up is my Comcast modem patched to my router which has two computers hooked up by ethernet (laptop and phones on wifi.) My gaming pc works just fine on ethernet but my HTPC does not (both running Windows 8.1.) All other computer besides my HTPC work fine on ethernet or wifi. I have tried plugging my HTPC directly to the Comcast modem but still get the same errors.

Here are the troubleshooting steps I've taken so far:

1.)Power cycle all computers and modem/router.

2.)Release/renew IP on HTPC.

3.)Flush DNS/reset TCP/IP/reset winsock

4.)Assign static IP (did this on both the router settings as well as IPv4 settings.)

5.)Replaced ethernet cable

6.)Check for driver updates for my ethernet adapter Realtek PCIe GBE Family Controller (there were none.)
Uninstalled and reinstalled driver anyway.

7.)Restore router and modem to factory settings and then steps 2-4 again just in case.

I'm pretty certain (although I may be wrong) that my adapter is not broken as I figure it would not show up in my device manager. If that's the problem then great, they're cheap.

I'm going to post my ipconfig /all log here but if any additional info would help you figure this out please just let me know.

Thanks.

Microsoft Windows [Version 6.3.9600]

© 2013 Microsoft Corporation. All rights reserved.

C:\Windows\system32>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : HTPC

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Hybrid

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Ethernet:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller

Physical Address. . . . . . . . . : D4-3D-7E-E1-20-62

DHCP Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

Link-local IPv6 Address . . . . . :

fe80::ac7d:4711:4b71:18%7(Preferred)

Autoconfiguration IPv4 Address. . : 169.254.0.24(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.0.0

Default Gateway . . . . . . . . . :

DHCPv6 IAID . . . . . . . . . . . : 131349886

DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-D2-23-E9-D4-3D-7E-E1-20-62

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 Wi-Fi:

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Realtek RTL8188SU Wireless LAN 802.11n US

B 2.0 Network Adapter

Physical Address. . . . . . . . . : 00-0A-81-88-2C-AE

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Link-local IPv6 Address . . . . . : fe80::700e:1287:cb33:7e05%3(Preferred)

IPv4 Address. . . . . . . . . . . : 192.168.137.1(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Default Gateway . . . . . . . . . :

DHCPv6 IAID . . . . . . . . . . . : 50334337

DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-1A-D2-23-E9-D4- 3D-7E-E1-20-62

DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1


fec0:0:0:ffff::2%1
fec0:0:0:ffff::3%1

NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{B690DE0C-688D-43C2-BCDC-C7E96687E0AD}:

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.{8CB6D2D1-A86B-42B6-8F07-F8C25EE533D6}:

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* 3:

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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#2 Kilroy

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Posted 14 April 2014 - 12:45 PM

The network card is not getting a DHCP address and is coming up with a 169.254.x.x address.  Do you have MAC filtering set up on the router? 

 

What happens if you disconnect everything from the modem, reset the modem, connect the HTPC to the modem, and then power on the HTPC?  Comcast only gives you one address and the modem remembers the last device connected and won't work with a new device until it is reset.






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