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Debuging a Wired LAN problem

  • 19-05-2012 6:32pm
    #1
    DriveSkill
    Registered Users, Registered Users 2 Posts: 757 ✭✭✭


    Hi,

    I'm trying to debug a problem where 2 PCs on a wired LAN do not appear to be able to talk to each other. When one is wireless it works fine!

    Setup :

    • Standard Eircom Router/Modem which has been reset to default
    • PCs running Windows XP one of which is sharing a folder
    • IP address range is same for both Wired and Wireless LAN

    Behaviour :

    Wireless Setup - PC connects to the LAN, gets valid IP, Default gateway is fine. I have full internet access, can ping to other PC and access the shared folder. All seems to work OK, the only issue is that occasionally there is something interfering with the wireless signal so would prefer them to be wired.

    Wired Setup - PC connects to the LAN and gets IP, same default Gateway being the router but cannot ping to the other PC (which is also wired into the same router) and therefore as there is no communication path I equally cannot access the shared folder. I have full access to the internet however so its obviously getting as far as the router. One point to note is the Wired connection is using a relatively long (~20 meter) cable but as I have full internet access with it I assume cable is OK.

    Other info :
    • Windows Firewall is disabled on both PCs
    • McAfee running on both but tried disabling its firewall and made no difference
    • Even tried disable router firewall but dont think that would have any impact

    Network connections properties look fine to me, auto DNS and DHCP used but any advice on specifics to check would be helpful perhaps.

    There is something I'm obviously missing...

    Suggestions please on what to check or how to debug.

    Thanks,
    Declan.


Comments

  • #2
    Cuddlesworth
    Registered Users, Registered Users 2 Posts: 14,010 ✭✭✭✭Cuddlesworth


    On the wired connection, have you tried pinging both ways. If one works and the other doesn't then its a firewall issue. On the one that can't be pinged.


  • #3
    brianwalshcork
    Registered Users, Registered Users 2 Posts: 611 ✭✭✭brianwalshcork


    Open a command prompt on both computers and type:

    ipconfig /all > config.txt

    The open config.txt in notepad and paste the contents into a reply here....


  • #4
    FSL
    Registered Users, Registered Users 2 Posts: 1,456 ✭✭✭FSL


    Try disabling the wireless adapter. If the PC has two active network connections it can sometimes confuse file sharing.


  • #5
    DriveSkill
    Registered Users, Registered Users 2 Posts: 757 ✭✭✭DriveSkill


    Thanks for the replies, unfortunately not near the PCs at the moment but will try and get them either this evening or tomorrow and try out some of these suggestions.

    More always welcome :)

    Thanks!


  • #6
    Hijpo
    Registered Users, Registered Users 2 Posts: 4,085 ✭✭✭Hijpo


    DriveSkill wrote: »
    Thanks for the replies, unfortunately not near the PCs at the moment but will try and get them either this evening or tomorrow and try out some of these suggestions.

    More always welcome :)

    Thanks!

    Just throwin it out there but it wouldnt have anythin to do with port speeds or duplex settigs?


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  • #7
    uch
    Registered Users, Registered Users 2 Posts: 7,020 ✭✭✭uch


    Try adding entries to Hosts file on both PC's.

    21/25



  • #8
    matt-dublin
    Registered Users, Registered Users 2 Posts: 4,468 ✭✭✭matt-dublin


    Totally sounds like a firewall issue or ipsec issue.

    are you sure there's no other firewall software present?


  • #9
    DriveSkill
    Registered Users, Registered Users 2 Posts: 757 ✭✭✭DriveSkill


    Apologies for the delay, here are some results - still same issue. Firewall is off on both machines and McAfee firewall is disabled.

    PC 1 - on Wired LAN Connection :

    Output from ipconfig /all :

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : Office-PC2
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Realtek RTL8168C(P)/8111C(P) PCI-E Gigabit Ethernet NIC
    Physical Address. . . . . . . . . : 00-1F-29-D8-DD-C1
    Dhcp Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    IP Address. . . . . . . . . . . . : 192.168.1.5
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 192.168.1.254
    DHCP Server . . . . . . . . . . . : 192.168.1.254
    DNS Servers . . . . . . . . . . . : 192.168.1.254
    Primary WINS Server . . . . . . . : 192.168.1.254
    Secondary WINS Server . . . . . . : 192.168.1.254
    Lease Obtained. . . . . . . . . . : 23 May 2012 19:20:44
    Lease Expires . . . . . . . . . . : 26 May 2012 19:20:44


    Ping Results to other PC :


    Pinging 192.168.1.3 with 32 bytes of data:

    Request timed out.
    Request timed out.
    Request timed out.
    Request timed out.

    Ping statistics for 192.168.1.3:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

    Ping to Google :


    Pinging www-cctld.l.google.com [209.85.143.94] with 32 bytes of data:

    Reply from 209.85.143.94: bytes=32 time=44ms TTL=53
    Reply from 209.85.143.94: bytes=32 time=44ms TTL=53
    Reply from 209.85.143.94: bytes=32 time=43ms TTL=53
    Reply from 209.85.143.94: bytes=32 time=44ms TTL=53

    Ping statistics for 209.85.143.94:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 43ms, Maximum = 44ms, Average = 43ms

    PC 1 - on Wireless :


    Windows IP Configuration

    Host Name . . . . . . . . . . . . : Office-PC2
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No

    Ethernet adapter Wireless Network Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Realtek RTL8188CU Wireless LAN 802.11n USB 2.0 Network Adapter
    Physical Address. . . . . . . . . : 00-E0-4C-0B-59-EA
    Dhcp Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    IP Address. . . . . . . . . . . . : 192.168.1.4
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 192.168.1.254
    DHCP Server . . . . . . . . . . . : 192.168.1.254
    DNS Servers . . . . . . . . . . . : 192.168.1.254
    Primary WINS Server . . . . . . . : 192.168.1.254
    Secondary WINS Server . . . . . . : 192.168.1.254
    Lease Obtained. . . . . . . . . . : 23 May 2012 19:57:33
    Lease Expires . . . . . . . . . . : 26 May 2012 19:57:33

    Ping to other PC :

    Pinging 192.168.1.3 with 32 bytes of data:

    Reply from 192.168.1.3: bytes=32 time=5ms TTL=64
    Reply from 192.168.1.3: bytes=32 time=15ms TTL=64
    Reply from 192.168.1.3: bytes=32 time=968ms TTL=64
    Reply from 192.168.1.3: bytes=32 time=15ms TTL=64

    Ping statistics for 192.168.1.3:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 5ms, Maximum = 968ms, Average = 250ms

    Ping to Google also works...


  • #10
    DriveSkill
    Registered Users, Registered Users 2 Posts: 757 ✭✭✭DriveSkill


    This is the view from the other machine which is permanently wired to the LAN:

    ipconfig output :


    Windows IP Configuration

    Host Name . . . . . . . . . . . . : HP20162765921
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Realtek RTL8139/810x Family Fast Ethernet NIC
    Physical Address. . . . . . . . . : 00-16-17-9D-FC-C7
    Dhcp Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    IP Address. . . . . . . . . . . . : 192.168.1.3
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 192.168.1.254
    DHCP Server . . . . . . . . . . . : 192.168.1.254
    DNS Servers . . . . . . . . . . . : 192.168.1.254
    Primary WINS Server . . . . . . . : 192.168.1.254
    Secondary WINS Server . . . . . . : 192.168.1.254
    Lease Obtained. . . . . . . . . . : 23 May 2012 19:05:00
    Lease Expires . . . . . . . . . . : 26 May 2012 19:05:00

    Ping to Other PC when other PC is wired :

    Pinging 192.168.1.5 with 32 bytes of data:

    Request timed out.
    Request timed out.
    Request timed out.
    Request timed out.

    Ping statistics for 192.168.1.5:
    Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

    Pinging it when it is wireless :

    Pinging 192.168.1.4 with 32 bytes of data:

    Reply from 192.168.1.4: bytes=32 time=5ms TTL=64
    Reply from 192.168.1.4: bytes=32 time=15ms TTL=64
    Reply from 192.168.1.4: bytes=32 time=14ms TTL=64
    Reply from 192.168.1.4: bytes=32 time=14ms TTL=64

    Ping statistics for 192.168.1.4:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 5ms, Maximum = 15ms, Average = 12ms


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