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Strange issue with DHCP Clients RRS feed

  • Question

  • We have setup 2 dhcp servers, 1 in a local site and 1 remote for failover. We have an iphelper statement on the switch so that if the local dhcp server is unavailable the clients will get the address from the remote dhcp server. The issue we are having is 90% of the clients are getting their addresses from the remote dhcp server. Does anyone have any ideas why this would be happening? The only good thing is we know that failover is working, however we do not want the clients to be getting the addresses from the remote server unless that server is down.

    Thanks,

    Gavin

    Thursday, November 17, 2016 7:19 PM

All replies

  • Hi Gavin,

    >>We have an iphelper statement on the switch so that if the local dhcp server is unavailable

    Please disable iphelper statement and try to renew client's ip again.

    >> The issue we are having is 90% of the clients are getting their addresses from the remote dhcp server.

    Other clients obtain IP address from local DHCP server?

    If yes, please check if Iphelper configuration is correct and then you could contact with switch provider for effect support.

    You could catch packet to analyze issue after you disabled iphelper, please check if client has sent request or DHCP server has received broadcast packet.

    Best Regards

    John


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    Friday, November 18, 2016 5:53 AM
  • Hi Gavin,

    One option to try is the Delay on the DHCP server. Right-click the Scope, go to Properties. On the Advanced tab, at the bottom, you can configure a delay before the server responds. You could add a delay to the remote server so that clients end up getting an address from the local server first.

    Hope that helps.

    Friday, November 25, 2016 8:52 PM