Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I get my internet connection from a guy (lets call him my service provider henceforth). He gives internet connections to many students here in my hostel. My PC gets a private IP through his DHCP server. Now, when I switch on my WiFi, my PC gets a private IP as it should and I can connect to the internet just fine. But now when I connect my LAN cable, my PC gets some "Autoconfiguration IPv4 address" 169.254.110.154(Preferred) and I cannot connect to the internet. Here is the ipconfig /all output for ethernet port:

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Marvell Yukon 88E8059 PCI-E Gigabit Ethernet Controller
   Physical Address. . . . . . . . . : <<MAC DISPLAYED HERE>>
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::5054:a347:7d06:6e9a%11(Preferred)
   Autoconfiguration IPv4 Address. . : 169.254.110.154(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.0.0
   Default Gateway . . . . . . . . . :
   DHCPv6 IAID . . . . . . . . . . . : 285222078
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-50-AC-68-54-42-49-EE-52-16
   DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
                                       fec0:0:0:ffff::2%1
                                       fec0:0:0:ffff::3%1
   NetBIOS over Tcpip. . . . . . . . : Enabled

I also tried:

Start a command prompt as admin.
Run "netsh winsock reset"
Run "netsh interface ipv4 reset"
Run "netsh interface ipv6 reset"
Restart your computer.

All this does not work. Any idea to solve the problem?

share|improve this question
    
Hi aledovsky, yes, my service provider gives me both wired and wireless. All connections - wired or wireless - have to take IP from DHCP server. Also, I did not switch computer. Infact my WiFi card got damaged so I bought a new WiFi adapter. But wireless is running fine. Problem is with wired! –  GuiccoPiano Sep 9 '12 at 10:18
    
Any help from anyone?? –  GuiccoPiano Sep 10 '12 at 8:51
    
ISSUE SOLVED! Hi all Thank you all for your replies. However the problem was with DHCP server itself. I had to go and personally force my service provider guy to check his DHCP configuration. He had made a wrong mapping between MAC and IP address and so my machine was using auto-configuration address. –  GuiccoPiano Sep 11 '12 at 8:15
    
I'm glad you found a solution! Please post this as an answer to your question and then accept it. –  hinekyle Mar 25 '13 at 14:31

1 Answer 1

up vote 0 down vote accepted

Actually it was the problem with my Internet Provider. It was a DHCP configuration problem. Probably he had mapped the same IP to 2 different MAC addresses or something. I only know that the problem was in configuration of DHCP server on the service providers side. So in future if anyone gets this kind of problem, be sure to check your DHCP configuration of mapping between MAC and IP address first.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.