none
DHCP Issue: Device Getting IP Address of Server Despite Reservation RRS feed

  • Question

  • Had issue on network where we couldn't print or access shared drive on server. Ended up being due to a device that somehow received the same IP address as the file and print server.

    Verified that there was reservation for the server's MAC address so that it could only have that IP address and also had the IP address configured staticly on the Server.

    After several weeks the same scenario occurred again where we couldn't print or access shared drive. When I pinged the server (xxx.xxx.xxx.x50) I would get replies from (xxx.xxx.xxx.x64). 

    Does this indicate some kind of rogue activity on the network? Since I have a reservation/exclusion for the server's IP address I'm at a loss as to how another device can be replying to communication intended for this file and print server and disrupt the network.

    Any ideas on how you would start troubleshooting and/or preventing this intermittent issue?

    It didn't start happening until recently and I've never had this issue on this particular small business network for years upon years.

    Monday, November 18, 2019 12:19 AM

All replies

  • Hi ,

    Did it report the conflict mark when you run ipconfig /all on this file and print server? 

    >>Ended up being due to a device that somehow received the same IP address as the file and print server.

    >>Since I have a reservation/exclusion for the server's IP address I'm at a loss as to how another device can be replying to communication intended for this file and print server and disrupt the network.

    I would suspect that somebody manually configured static IP for this device.

    Please change the duplicate IP on this device and then check if the issue still happens.

    If the phenomenon still happens, please change the reservation IP for this file and print server to do a test.

    Best Regards,

    Candy


    Please remember to mark the replies as an answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com   

    Monday, November 18, 2019 6:26 AM
  • Hi ,

    Just want to confirm the current situations.

    Please feel free to let us know if you need further assistance.                   

    Best Regards,

    Candy


    Please remember to mark the replies as an answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com   

    Wednesday, November 20, 2019 2:06 AM
  • Good morning BigTino

    It would sound like a machine has a static IP that is causing the conflict.

    Can you do a NSLOOKUP to determine which machine is grabbing the IP? If you do find a statically assigned machine, then set it to dhcp, or another free static address.

    Kindest regards

    Darren

    Wednesday, November 20, 2019 7:36 AM
  • Hi ,

    You could mark the useful reply as answer if you want to end this thread up.

    If there is anything else we can do for you, please feel free to post in the forum.

    Best Regards,

    Candy


    Please remember to mark the replies as an answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com   

    Friday, November 22, 2019 8:59 AM