ISC DHCPD giving out reserved IPs for non-reserved hosts
LACY_S at Mercer.edu
Mon Jul 9 13:11:50 UTC 2007
So Microsoft DHCP's behavior of reserving addresses specifically for
certain MACs is not standard? That's the first DHCP product I've used
(I know, I know), so I was assuming that ISC dhcpd would behave the same
John Wobus wrote:
> It's possible you are seeing normal behavior. If you are using host
> to attempt to reserve addresses, you are under a misimpression. Host
> do not reserve addresses; they merely tell the server to give a certain
> answer when they receive a certain MAC address.
> You reserve addresses by leaving them out of the configured ranges
> that are dynamically allocated.
> John Wobus
> On Jul 6, 2007, at 3:31 PM, Scott Lacy wrote:
>> I have a DHCP server running ISC DHCPD v3.0.3 on Fedora Core. I am
>> having an issue where dhcpd is giving out leases for reserved IP
>> addresses to hosts other than that which the addresses are reserved
>> for. There are no indication in the logs of any conflicts. The logs
>> look fairly vanilla and there was no indication of any trouble until I
>> got a call about an IP conflict with the machine the reservation is
>> for. The only quick way to resolve the problem was to power down the
>> offending device. Even removing the newly-issued lease from DHCP and
>> having the other device pull an address did not seem to help.
>> Is there anything that jumps out to any of you as far as things I
>> check my configuration for? I've run this installation for almost a
>> year and I've had this come up twice in the last month, both on
>> that were set up in DHCP long ago.
>> Scott Lacy
>> Systems Manager
>> Mercer University
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