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Network connectivity problem...

Hi all..


I am facing network connectivity problem with few of the pc's in my office wherein it can ping one system and cannot ping the other. I ensured whether problem with the switch / lan cable through cable tester the connectivity is fine . All the pc's fall under the same work group...This problem keeps killing me..

suggestions at the earliest are most welcomed...

Thanks in advance
Hari

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  • 6 more comments 
  • harikreative Mar 19, 2008

    Internet connectivity is made available through lan and all the computers can connect to the internet.



    Even windows default firewall is not configured and the antivirus installed is symantec it was fine till last week since then the problem arised,,,

  • harikreative Mar 19, 2008

    program is :10.1.0.394

    scan engine :71.4.0.15



    One more additional info i am not an expert like you but to me what it strikes is not because of symantec as because we have one system with kaspersky which was placed last week even i am not able to ping that pc totally confused sir...

  • harikreative Mar 19, 2008

    The type of ip config is class 'c' and subet id 255.255.255.0 in general i used to ping by ip no and it also pings using name...



    for particular 4 machines the problem exists..

  • John Dean
    John Dean May 11, 2010

    The Symantec looks to be symantec Corporate edition, which does not have a firewall. I agree this is not the issue.

  • John Dean
    John Dean May 11, 2010

    hmmm. Run IP config on both computers, compare the IP addresses on both. Are they on the same subnet?

    Example 1

    Computer 1 IP 10.0.0.2

    Computer 2 IP 10.0.0.3

    Subnet mask of both computers is 255.255.255.0

    These are on the same subnet.

    Example 2

    Computer 1 IP 10.0.0.2

    Computer 2 IP 10.0.1.2

    Subnet mask of 255.255.255.0

    These computers are NOT on the same subnet, and would not be able to communicate.



    Are you pinging by name or IP address?

    If by name, what happens when trying by IP address?

  • John Dean
    John Dean May 11, 2010

    What version of Symantec is it? Seen this many many times, can you disable the symantec software, just for a few minutes to test, does this help? If all can get to the internet, then it is not a physical network issue (Unless plugged into separate hubs/switches). Please let me know.

  • John Dean
    John Dean May 11, 2010

    Also, do you have a shared internet connection? If so can all of the computers get to the internet? If they can, we have just eliminated connectivity.

  • John Dean
    John Dean May 11, 2010

    Do you have any firewall software installed like Norton 360, Internet protection things like this? If so, if you disable this software, are you able to ping things after the software is disabled? If so, I suggest editing the firewall software settings to allow communication on your local network (More details to come if this helps.)

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  • 41 Answers

Most likely issue is no common server on the network to specify which computer has what IP address and associate that with a name. Bob's computer gets a different IP address each time he turns it on, and the same happens with Sally. But Joe's always seems to get the same IP, so everybody can always find Joe. Specifying static IP addresses on all computers is a beginning to solving this, then I would edit the hosts file on each computer to specify that Bob is at IP x.x.x.x, and Sally is x.x.x.x, and Joe is x.x.x.x, copy this hosts file to all computers, and edit it when new computers are added. Another solution would be to get a Windows Server that is doing both the DHCP (Assigning Addresses) and DNS (A computer program running on a server, translating names into IP addresses), all computers will ask the DNS server where Bob is, and get a response from an internal server that says bob is x.x.x.x
The issue you are having is the number one reason to get away from a peer-to-peer network.

Posted on Mar 19, 2008

  • John Dean
    John Dean Mar 19, 2008

    More info on what does work would be helpful. We know you can't ping certain computers, but that implies that you can ping others. What is different about the ones that work vs. the ones that do not work.

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