No ACK Received / not getting a lease

[Glenn Satchell]

Hi Malte

Usually this type of thing is a bug in the client because the vendor only
tested with the windows dhcp server.

If you can run up a windows dhcp service for testing and capture the
packets sent back from the server. It is likely there is some additional
dhcp option that is turned on or off, and adding this setting to the ISC
dhcp server will allow it to work just fine.

always-broadcast may or may not help. Compare the responses and see what
options the client likes to receive...

regards,
-glenn

> Hello there,
>
> It seems I've got some strange problem with my dhcp server (
> isc-dhcp-4.1.1-P1 ). The server receives relayed DHCP Requests which are
> taken and Acked from most of the clients (e.g. ims-11000-1).
> But some devices strangely don't accept the lease and keep on requesting a
> lease over and over again. As you can see I receive the Discover Message
> and send an offer. On the relaying router I can
> see that the offer messages are being redirected to the client but It does
> not seem to accept it and sends out Discover again. I've seen this
> behavior with other devices too (mostly switches but also
> ims-11000-99301). If I relay
> to a windows dhcp server, the same devices take a lease immediately. So
> this is only happening with linux dhcp. Does enabling always-broadcast
> help with this problem?
> Another thing is that the server starts serving leases somehow shuffled,
> can this be changed?
>
> Mar  1 14:51:21 dhcp01 dhcpd: DHCPREQUEST for 10.208.214.164 from
> 90:fb:a6:2c:d7:01 (ims-11000-1) via 10.208.214.162
> Mar  1 14:51:21 dhcp01 dhcpd: DHCPACK on 10.208.214.164 to
> 90:fb:a6:2c:d7:01 (ims-11000-1) via 10.208.214.162
> Mar  1 14:51:28 dhcp01 dhcpd: DHCPDISCOVER from 00:19:99:a7:43:99 via
> 10.208.214.162
> Mar  1 14:51:29 dhcp01 dhcpd: DHCPOFFER on 10.208.214.169 to
> 00:19:99:a7:43:99 (ims-11000-99301) via 10.208.214.162
> Mar  1 14:51:31 dhcp01 dhcpd: DHCPDISCOVER from d0:d0:fd:ae:e7:28
> (BSPD0D0FDAEE728) via 10.132.112.2
> Mar  1 14:51:31 dhcp01 dhcpd: DHCPOFFER on 10.132.113.189 to
> d0:d0:fd:ae:e7:28 (BSPD0D0FDAEE728) via 10.132.112.2
> Mar  1 14:51:35 dhcp01 dhcpd: DHCPDISCOVER from 00:19:99:a7:43:99
> (ims-11000-99301) via 10.208.214.162
> Mar  1 14:51:35 dhcp01 dhcpd: DHCPOFFER on 10.208.214.169 to
> 00:19:99:a7:43:99 (ims-11000-99301) via 10.208.214.162
> Mar  1 14:51:42 dhcp01 dhcpd: DHCPREQUEST for 10.208.214.164 from
> 90:fb:a6:2c:d7:01 (ims-11000-1) via 10.208.214.162
> Mar  1 14:51:42 dhcp01 dhcpd: DHCPACK on 10.208.214.164 to
> 90:fb:a6:2c:d7:01 (ims-11000-1) via 10.208.214.162
> Mar  1 14:51:43 dhcp01 dhcpd: DHCPDISCOVER from d0:d0:fd:ae:e7:28
> (BSPD0D0FDAEE728) via 10.132.112.2
> Mar  1 14:51:43 dhcp01 dhcpd: DHCPOFFER on 10.132.113.189 to
> d0:d0:fd:ae:e7:28 (BSPD0D0FDAEE728) via 10.132.112.2
>
> Best regards
>
> Malte Küppers
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