one-lease-per-client... seriously

[Jeff Wieland]

Jeff Wieland, UNIX/Network Systems Administrator
Purdue University IT Infrastructure Services UNIX Platforms



Brian Rak wrote:
>
>
> On 9/15/2016 4:33 PM, Jeff Wieland wrote:
>> Brian Rak wrote:
>>> I'm running into an issue where DHCPD (v4.3.4 and older versions) is 
>>> issuing multiple leases to the same mac address.  It appears to be 
>>> looking at the DHCP Client-ID field to determine what a unique 
>>> client is.  I'd much rather it ignore everything except for the 
>>> client's mac address, but I can't seem to find an option to do this.
>>>
>>> I already have:
>>>
>>> one-lease-per-client                                    true;
>>> deny duplicates;
>>>
>>> in my config, which doesn't seem to be helping.
>>>
>>> This is a problem, because I'm using DHCP for PXE booting, which 
>>> means each machine ends up getting three concurrent leases:
>>>
>>> one via the firmware built into the nic
>>> iPXE then gets chainloaded, and gets another lease
>>> the actual OS gets loaded, and gets a different lease
>>>
>>> It's very difficult to get these all to share leases, and I'd really 
>>> much rather handle this on the DHCP server side.  DNSMasq can do 
>>> this, but it doesn't scale well enough.
>>>
>>>
>> I've not used it, but it looks like the ignore-client-uids statement 
>> might work.
> That looks like exactly what I wanted, thanks.  I guess I was looking 
> at an old man page.
Not a problem.  I'm curious as to whether it works.

--
Jeff Wieland, UNIX/Network Systems Administrator
Purdue University IT Infrastructure Services UNIX Platforms