Troubleshooting: no free leases

[Bill Shirley]

My guess is your client is both a member of "win" and "wp" which, according to
pool definitions, can't be satisfied.

Bill


On 7/20/2017 10:27 PM, timeless wrote:
> Hi,
> fwiw, I just upgraded isc-dhcp-server, I'm now running: 4.3.1-6+deb8u2 (things were working fine before that point, I'm not 
> sure offhand what version I was running previously,  unfortunately). And I got the problem below. I've since upgraded to 
> 4.3.5-3 (Debian stretch) without any improvement.
>
> And I hit "no free leases".
> I'm hoping someone could help me figure out what's going wrong / how to fix it.
>
> This is most of my dhcpd.conf [1] file.
>
> The client I'm trying to get a lease for is a modern.ie <http://modern.ie> Windows10 VM [2] running in VirtualBox 5.1.24 on 
> macOS Sierra w/ guest additions Bridging an Thunderbolt Ethernet Adapter [MAC address: 08:00:27:d0:ad:b7]
> WireShark shows the windows 10 system sends:
>   MSEDGEWIN10<.MSFT 5.07
> WireShark reports it as:
>   Client FQDN: MSEDGEWIN10
>   vendor-class-data: MSFT 5.0
> ... which should match my "win" class.
>
> None of my pool ranges appear "full" [3].
>
> The class match is not logged.
>
> For comparison, here's background logging [4], and what I get when I troubleshoot the Windows 10 network [5].
>
> pool 10.4.6.1 .. 10.4.6.254 has allow unknown-clients, which is where it would go if it wasn't matched.
>
> One basic question I have is: How do i tell if a pool is "full"?
>
> It would be very helpful to me for debugging if I could get isc-dhcp-server to "explain" how it decided that it had no more space.
>
> From my naive perspective none of my pools are full, but I'd rather be able to ask isc-dhcp-server its opinion.
>
> I also tried stopping isc-dhcp-server
>
>
> There's no configuration for a failover pair, and the word "failover" isn't present in my config file.
>
> I read: release notes [6] -- which shows that the logging was introduced in 3.0rc12
>
> I skimmed through: KB looking for "no free leases" [7] and the kb articles all seem to be about performance or failover.
>
> Thanks
>
> [1] https://www.irccloud.com/pastebin/OU5bsfhX/%2Fetc%2Fdhcp%2Fdhcpd.conf
> [2] https://developer.microsoft.com/en-us/microsoft-edge/tools/vms/
> [3] https://www.irccloud.com/pastebin/jibZxPPp/dhcpd.leases.trimmed
> [4] https://www.irccloud.com/pastebin/YJ6Nt04h/
> [5] https://www.irccloud.com/pastebin/HWE9aEvs/
> [6] https://kb.isc.org/article/AA-01357/0/DHCP-4.3.4b1-Release-Notes.html
> [7] 
> https://kb.isc.org/index.php?/searchResults/0/10/fU_NCoMwDH4V6RPYOeYWbxMEz-4uVSMK1Y42jg3x3ZeqA0-75fuSfD8KpITZgQxBOFS27h74JpEwcwYxmqC1iIFG5dB59vo7y0cPIxBKaz9deJqoM9YDFtu5WlHe8KcCtukhZPYEIpIiWdgi5qfmVeyCxVSlavXmE7Pq-1iNIsx6TWj3AOxYUj-gh7dtX7bWDAfneKfJHEjJsvXkyAxZj3pLFcLMQbgq_a3tc5gnjvdPaho2rrjJ8gU~ 
> <https://kb.isc.org/index.php?/searchResults/0/10/fU_NCoMwDH4V6RPYOeYWbxMEz-4uVSMK1Y42jg3x3ZeqA0-75fuSfD8KpITZgQxBOFS27h74JpEwcwYxmqC1iIFG5dB59vo7y0cPIxBKaz9deJqoM9YDFtu5WlHe8KcCtukhZPYEIpIiWdgi5qfmVeyCxVSlavXmE7Pq-1iNIsx6TWj3AOxYUj-gh7dtX7bWDAfneKfJHEjJsvXkyAxZj3pLFcLMQbgq_a3tc5gnjvdPaho2rrjJ8gU%7E>
>
>
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