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i have problem whith Cisco DHCP. On switch C6506 in "sh ip dhcp binding" table are the long MAC addres. What is the problem? The one MAC (00.16e6.448a.e4) have more IP addres.

158.195.40.46   id    ffe6.448a.e400.0100.011d.69e6.3900.16e6.448a.e4  Mar 12 2016 03:35 PM

158.195.46.201  id    ffe6.448a.e400.0100.011d.d88f.c400.16e6.448a.e4  Mar 12 2016 12:10 PM

158.195.46.202  id    0100.16e6.448a.e4  Mar 12 2016 02:09 PM

158.195.46.203  id    ffe6.448a.e400.0100.011d.d8b0.1b00.16e6.448a.e4  Mar 12 2016 02:28 PM

158.195.46.204  id    ffe6.448a.e400.0100.011d.d8b2.0500.16e6.448a.e4  Mar 14 2016 09:53 PM
Michal Rybar
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1 Answers1

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Answer is here: https://supportforums.cisco.com/discussion/12708241/weird-mac-address-dhcp-binding

"Okay. Please check the file /etc/dhcp/dhclient.conf on the Fedora machine and add the following line to the file:

send dhcp-client-identifier = hardware;

If there are any other instances of this command in that file, please remove them - make sure this is the only one."

Michal Rybar
  • 21
  • 4