lease limit 1 and Apple Mac Computers creates duplicate IP address

Oskar Berggren oskar.berggren at
Tue Sep 17 21:10:53 UTC 2013

This is one of the reasons many competent switches have support for
snooping the DHCP traffic and blocking IP-traffic with source addresses
other than those assigned by the DHCP server. Amongs ISP's it's also not
uncommon to isolate clients on (effectively) their own vlan. (Since
ethernet was not originally designed to cope with an environment where
clients are untrusted.)


2013/9/17 Matt Jenkins <matt at>

> Any known work around? Like have the DHCP server respond with no ip
> available instead of no response?
> On 09/14/2013 12:26 PM, Chris Buxton wrote:
>> On Sep 12, 2013, at 4:11 PM, Matt Jenkins <matt at>
>> wrote:
>>> I can reproduce both of the following situations. All result in a
>>> duplicate IP address issues. All appear to be the fault of Apple Mac OS.
>>> Has anyone else ever seen this or found a fix for it?
>>> 4. Apple computer connects and is unable to get a lease. It then assigns
>>> itself the original IP address it had. Now there is an IP conflict.
>> Yup. It's an Apple thing.
>> Regards,
>> Chris Buxton
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