[Kea-users] Strange behaviour with shared networks

Sutherland, Rob Robert.B.Sutherland at windstream.com
Fri Oct 20 20:09:43 UTC 2017


Like many others, I am evaluating Kea as a replacement for ISC DHCP. While I can get Kea to behave mostly as I like, I am seeing some odd behaviours when I use shared networks. Here's one:

A single phone is assigned an IP address (via dhcrelay). I deliberately set the renew-timer to a low value (100 seconds). When the phone sends a DHCPREQUEST for the same address (after 100 seconds), the server sends a DHCPNAK. This causes the phone to reboot and restart the DHCP cycle. The second time around the phone succeeds in getting an IP address but a different one.

I was running Kea with debugging turned on so I have attached the output (as well as the configuration file and a packet trace).

Here's the lease file showing the same MAC getting different IP addresses:
address,hwaddr,client_id,valid_lifetime,expire,subnet_id,fqdn_fwd,fqdn_rev,hostname,state
10.148.1.68,08:00:0f:6c:c5:a9,01:08:00:0f:6c:c5:a9,400,1508526744,2,0,0,,0
10.148.1.69,08:00:0f:6c:c5:a9,01:08:00:0f:6c:c5:a9,400,1508526896,2,0,0,,0

More on the environment:

*         Kea 1.3.0 beta

*         SLES12 server with more than enough CPU, RAM etc

Any thoughts?

Rob


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