Flagging users who statically assign dhcp pool addresses
cra at WPI.EDU
Tue Jan 15 23:45:09 UTC 2008
On Tue, Jan 15, 2008 at 11:22:39PM +0000, Simon Hobson wrote:
> Troy Nissen wrote:
>> I had an interesting question proposed to me today, and I am unsure of the
>> answer, so I thought I would post the question here.
>> Is there a mechanism built into ISC DHCP that will flag a user if they
>> have statically assigned their leased ip to their system?
> The only time it would show anywhere would be if the lease is expired and
> the server wants to re-allocate the address. In that case, if you haven't
> disabled "ping before offer", and the device isn't configured (eg firewall)
> not to respond to pings, then you would get an abandoned lease which would
> appear in the logs and the lease database.
You might troll the logs for DHCPDECLINE messages too. In those
cases, the client sent a DECLINE for the offered address because the
client got a response to an ARP query for that address on the client's
local network. Usually that means someone statically set that
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