Script to run on DHCPNAK

Mark Spring mspring at
Thu Jul 20 12:31:30 UTC 2017

isc, just one server  here is an example

*Jul 19 10:04:36 dhcp dhcpd: DHCPREQUEST for from
00:03:e6:6f:42:14 via <>: wrong net*
*Jul 19 10:04:36 dhcp dhcpd: DHCPNAK on to 00:03:e6:6f:42:14
*Jul 19 10:04:39 dhcp dhcpd: DHCPDISCOVER from 00:03:e6:6f:42:14 via*
*Jul 19 10:04:40 dhcp dhcpd: DHCPOFFER on to 00:03:e6:6f:42:14
*Jul 19 10:04:40 dhcp dhcpd: DHCPREQUEST for (
from 00:03:e6:6f:42:14 via 10.4.0.*
*Jul 19 10:04:40 dhcp dhcpd: DHCPACK on to 00:03:e6:6f:42:14 via*

Mark Spring
Information Systems Manager

On Thu, Jul 20, 2017 at 8:22 AM, perl-list <perl-list at> wrote:

> Are the NAK and ACK coming from the same server?  Can you post example log
> messages of the NAK and ACK and related communication?  I assume this is
> ISC DHCP that we are speaking of and not some proprietary DHCP server?
> ------------------------------
> I am having some issues with network gear, and while arguing with vendors
> about who's problem it really is..I noticed that my device receives a NAK
> before it receives the proper IP address from our server(when the gear
> comes back online). If I can track this down in the logs then I can look
> for the ACK that follows, login to the device and reboot it properly.
> ___
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at

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