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DHCP handing out multiple IPs to the same Mac Address

1487 Views 6 Replies Latest reply: Mar 6, 2013 7:20 AM by John.Kennedy RSS
John.Kennedy Calculating status...
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Sep 2, 2011 7:38 AM

My server has been assigning multiple IPs to the same client.  Any ideas?  An iphone will have 13 IP address, a desktop will have 20+.  My lease time is set to 10 days because I assumed if the client already had an IP it wouldn't ask the DHCP for another but now i'm realizing we are getting alot of clients with duplicate IPs.


Any idea?

Xserve, Mac OS X (10.6.8)
  • piperspace Level 2 Level 2 (240 points)

    As far as i know it's not possible for a device to use more than one IP at a time. What exactly are you seeing to suggest your devices are using 13 or 20? Most problems with dhcp are caused by having more than one dhcp server. Like both an airport and a server configured to hand out IPs.

  • Decio Valeri Calculating status...



    i saw a similar issue caused by repeated client id.


    Make sure that your clients doesn't have the same client id in the network DHCP option


    Actually the dhcp' "client ID" option is encoded by the server like a MAC addres:

    in case of repeated MAC for differents clients, the server react by delivering multiples addrsses until the end of leases 

  • s_landon Calculating status...

    My DHCP server was doing that also. Did you ever get it fix?


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