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  • Lose access to external systems

    Hello,
    I am wondering if anybody would be able to give me any insight to this? I work small to medium shop where we have one domain with about 20 servers and 60 desktops. We also access a Exchange server for E-Mail and several other corporate web servers that are in another domain.
    The problem that some users are having is random where they cannot access the Exchange server or any of the external websites. They lose connectivity to those systems. I try to ping them and I am not able to. If I re-lease and re-new there IP address then they are then able to access the external systems again.
    We never have a issue accessing system in our domain. It is only the external systems. I am trying to get an idea on why some systems stop accessing those sites. Could it be something in the routers? Any help or ideas would be great.
    Thanks..

  • #2
    Re: Lose access to external systems

    How do you connect to the internet / to external systems?
    Does it happen to clients one at a time or to all at once (if so, it is probably a router issue)

    Can you post the results of an ipconfig/all from a working and from a non-working client?
    Tom Jones
    MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
    PhD, MSc, FIAP, MIITT
    IT Trainer / Consultant
    Ossian Ltd
    Scotland

    ** Remember to give credit where credit is due and leave reputation points where appropriate **

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    • #3
      Re: Lose access to external systems

      All workstations get there info from DHCP. Clients are random. One at a time. I'll post the info the next time it happens to a system here.
      Thanks...



      Originally posted by Ossian View Post
      How do you connect to the internet / to external systems?
      Does it happen to clients one at a time or to all at once (if so, it is probably a router issue)

      Can you post the results of an ipconfig/all from a working and from a non-working client?

      Comment


      • #4
        Re: Lose access to external systems

        Does the failing client actually getting his ip settings?
        Marcel
        Technical Consultant
        Netherlands
        http://www.phetios.com
        http://blog.nessus.nl

        MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
        "No matter how secure, there is always the human factor."

        "Enjoy life today, tomorrow may never come."
        "If you're going through hell, keep going. ~Winston Churchill"

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        • #5
          Re: Lose access to external systems

          Here is a workstation that was not able to go to a extrnal site. When I released and then renewed the IP address the workstation was then able to access the site.
          Before Renewing
          Windows IP Configuration

          Host Name . . . . . . . . . . . . : SDNOCCSR01
          Primary Dns Suffix . . . . . . . : acc.net
          Node Type . . . . . . . . . . . . : Hybrid
          IP Routing Enabled. . . . . . . . : No
          WINS Proxy Enabled. . . . . . . . : No
          DNS Suffix Search List. . . . . . : acc.net
          acc.net

          Ethernet adapter Local Area Connection:

          Connection-specific DNS Suffix . : acc.net
          Description . . . . . . . . . . . : Intel(R) 82566DM Gigabit Network Connection
          Physical Address. . . . . . . . . : 00-23-7D-B6-3D-20
          Dhcp Enabled. . . . . . . . . . . : Yes
          Autoconfiguration Enabled . . . . : Yes
          IP Address. . . . . . . . . . . . : 10.77.25.158
          Subnet Mask . . . . . . . . . . . : 255.255.255.192
          Default Gateway . . . . . . . . . : 10.77.25.129
          DHCP Server . . . . . . . . . . . : 10.77.25.126
          DNS Servers . . . . . . . . . . . : 10.77.25.126
          10.77.25.120
          192.168.74.4
          Primary WINS Server . . . . . . . : 10.77.25.126
          Secondary WINS Server . . . . . . : 192.168.74.4
          Lease Obtained. . . . . . . . . . : Wednesday, September 01, 2010 2:21:36 AM
          Lease Expires . . . . . . . . . . : Thursday, September 09, 2010 2:21:36 AM

          After Renewing
          Windows IP Configuration

          Host Name . . . . . . . . . . . . : SDNOCCSR01
          Primary Dns Suffix . . . . . . . : acc.net
          Node Type . . . . . . . . . . . . : Hybrid
          IP Routing Enabled. . . . . . . . : No
          WINS Proxy Enabled. . . . . . . . : No
          DNS Suffix Search List. . . . . . : acc.net
          acc.net

          Ethernet adapter Local Area Connection:

          Connection-specific DNS Suffix . : acc.net
          Description . . . . . . . . . . . : Intel(R) 82566DM Gigabit Network Connection
          Physical Address. . . . . . . . . : 00-23-7D-B6-3D-20
          Dhcp Enabled. . . . . . . . . . . : Yes
          Autoconfiguration Enabled . . . . : Yes
          IP Address. . . . . . . . . . . . : 10.77.25.158
          Subnet Mask . . . . . . . . . . . : 255.255.255.192
          Default Gateway . . . . . . . . . : 10.77.25.129
          DHCP Server . . . . . . . . . . . : 10.77.25.126
          DNS Servers . . . . . . . . . . . : 10.77.25.126
          10.77.25.120
          192.168.74.4
          Primary WINS Server . . . . . . . : 10.77.25.126
          Secondary WINS Server . . . . . . : 192.168.74.4
          Lease Obtained. . . . . . . . . . : Wednesday, September 01, 2010 8:33:57 AM
          Lease Expires . . . . . . . . . . : Thursday, September 09, 2010 8:33:57 AM





          Originally posted by Ossian View Post
          How do you connect to the internet / to external systems?
          Does it happen to clients one at a time or to all at once (if so, it is probably a router issue)

          Can you post the results of an ipconfig/all from a working and from a non-working client?
          Last edited by derdude; 3rd September 2010, 02:32.

          Comment


          • #6
            Re: Lose access to external systems

            That Mask gives you 62 Hosts per subnet; sort of limiting.
            You have 20 Servers and 60 Workstations. What subnet are the Servers on?
            Any network printers on the same subnet? Static, Dynamic (Reserved)?
            Do these workstations also lose access to Internal systems as well?

            With the limited info supplied I would suggest changing the SubNet Mask to something where you are not inclined to run out of IPs to assign.
            1 1 was a racehorse.
            2 2 was 1 2.
            1 1 1 1 race 1 day,
            2 2 1 1 2

            Comment


            • #7
              Re: Lose access to external systems

              The majority of systems on the subnet are workstations. There is one member server on the subnet that has a reserved IP address. There is one printer with a static IP address. The internal sites do not get lost. It is only access to external sites.
              I have also tried using the DNS server on the other corporate network but it does the same when trying to access those websites.



              Originally posted by biggles77 View Post
              That Mask gives you 62 Hosts per subnet; sort of limiting.
              You have 20 Servers and 60 Workstations. What subnet are the Servers on?
              Any network printers on the same subnet? Static, Dynamic (Reserved)?
              Do these workstations also lose access to Internal systems as well?

              With the limited info supplied I would suggest changing the SubNet Mask to something where you are not inclined to run out of IPs to assign.

              Comment

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