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Wired DHCP issue: works at one home, not the other. Wireless is fine

By kcrouse96h
Aug 5, 2010
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  1. My laptop can connect wirelessly to my network, but it cannot connect via it’s wired NIC. Actually, skype will still work, but outlook mail and browsers do not.
    The cat6 cable is ok. I have tested it on another computer. The NIC is ok. My wired connection works just fine at my other house (let’s call it Location 2), which has a similar setup. So, in summary…
    At Location 1, my wireless connection receives an expected DHCP IP Address of 192.168….
    At location 2, my wireless AND wired connections both receive expected 192.168… addresses (I don’t connect them at the same time)
    At Location 1, here is the problem, my wired connection receives a crazy address. When I ipconfig /release and /renew this wired address, it doesn’t change.

    Any ideas? Thanks.

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Broadcom NetXtreme 57xx Gigabit Controller
    Physical Address. . . . . . . . . : 00-------
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::c959:894d:d1ed:6f%12(Preferred)
    IPv4 Address. . . . . . . . . . . : 116.86.68.15(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.254.0
    Lease Obtained. . . . . . . . . . : Wednesday, August 04, 2010 10:25:02 PM
    Lease Expires . . . . . . . . . . : Thursday, August 05, 2010 4:53:36 AM
    Default Gateway . . . . . . . . . : fe80::226:5aff:fefb:5b26%12
    116.86.68.1
    DHCP Server . . . . . . . . . . . : 172.17.0.48
    DNS Servers . . . . . . . . . . . : 192.168.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Wireless LAN adapter Wireless Network Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Intel(R) Wireless WiFi Link 4965AGN
    Physical Address. . . . . . . . . : 00--------
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80xxxxxx(Preferred)
    IPv4 Address. . . . . . . . . . . : 192.168.0.30(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Lease Obtained. . . . . . . . . . : Wednesday, August 04, 2010 10:34:22 PM
    Lease Expires . . . . . . . . . . : Wednesday, August 11, 2010 10:34:22 PM
    Default Gateway . . . . . . . . . : fe80::226:5aff:fefb:5b26%11
    192.168.0.1
    DHCP Server . . . . . . . . . . . : 192.168.0.1
    DNS Servers . . . . . . . . . . . : 192.168.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled



    My configuration is:
    Cable modem -> DIR-825 router -> dlink 24-port gigabit switch
    then off the 24-port switch are:
    DAP-1353 wireless access point extender
    5-port dlink gigabit switch
    4 Windows 7 pc's. 4 XP pc's. a bunch of stereo equipment, tv, xbox, etc.
     
  2. jobeard

    jobeard TS Ambassador Posts: 9,322   +622

    Notice that the WiFI IPv4 address and the gateway+dns addresses are all on the same subnet (a requirement :grinthumb )
    The Wired Nic is a mess; the IPv4 address is not connected to the same gateway + DNS subnet.

    For Win/XP, uninstall IPv6;
    For your Win/7 just disable IPv6 and reboot.
     
  3. kcrouse96h

    kcrouse96h TS Rookie Topic Starter

    yes, that's the problem! How do I fix the settings on the NIC? It works fine at location 2 (gets assigned an IP Address as expected in the 192.168.0.xxx range and the subnet is the typical 255.255.255.0, and the dhcp and dns are both 192.168.0.1. But at location 1, it is all messed up and I can't ipconfig /release and ipconfig /renew to fix it. something is wrong with dhcp, but only at location 1.

    sorry, here is the actual screen dump with the addresses intact. I thought it might be unsafe to post full macid's (so i keep them deleted--posts crossed in the mail).

    Wired...
    Description . . . . . . . . . . . : Broadcom NetXtreme 57xx Gigabit Controller
    Physical Address. . . . . . . . . : 00-deleted
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::c959:894d:d1ed:6f%12(Preferred)
    IPv4 Address. . . . . . . . . . . : 116.86.68.50(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.254.0
    Lease Obtained. . . . . . . . . . : Thursday, August 05, 2010 8:01:33 PM
    Lease Expires . . . . . . . . . . : Friday, August 06, 2010 12:01:32 AM
    Default Gateway . . . . . . . . . : fe80::226:5aff:fefb:5b26%12
    116.86.68.1
    DHCP Server . . . . . . . . . . . : 172.17.0.48
    DNS Servers . . . . . . . . . . . : 192.168.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled



    Wireless LAN adapter Wireless Network Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Intel(R) Wireless WiFi Link 4965AGN
    Physical Address. . . . . . . . . : 00-deleted
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::18e5:39b9:da41:ed6c%11(Preferred)
    IPv4 Address. . . . . . . . . . . : 192.168.0.30(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Lease Obtained. . . . . . . . . . : Thursday, August 05, 2010 11:41:39 PM
    Lease Expires . . . . . . . . . . : Thursday, August 12, 2010 11:41:39 PM
    Default Gateway . . . . . . . . . : fe80::226:5aff:fefb:5b26%11
    192.168.0.1
    DHCP Server . . . . . . . . . . . : 192.168.0.1
    DNS Servers . . . . . . . . . . . : 192.168.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled
     
  4. jobeard

    jobeard TS Ambassador Posts: 9,322   +622

    YOU WERE CORRECT!!! Edit that post and delete the MAC!
     
  5. jobeard

    jobeard TS Ambassador Posts: 9,322   +622

  6. kcrouse96h

    kcrouse96h TS Rookie Topic Starter

    disabling IPv6 did the trick. Many thanks. Disabling IPv6 permanently requires a reg edit. otherwise, it gets turned back on every reboot I believe.
     
  7. jobeard

    jobeard TS Ambassador Posts: 9,322   +622

    you are correct :wave:
     
  8. kcrouse96h

    kcrouse96h TS Rookie Topic Starter

    disabling IPv6 only worked for a minute, haha. but now I found the real culprit. my cable tv box has a DHCP server in it so there were 2 of them active on my network. i unplugged its ethernet cable (didn't need it anyway I don't think) and the network is stable now. well, at least for the last few hours...
     

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