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Bug #15328

closed

Changes in Kea DHCP interface pools may invalidate lease database content

Added by Tom Lane 9 months ago. Updated about 2 months ago.

Status:
Resolved
Priority:
Normal
Assignee:
Christian McDonald
Category:
DHCP (IPv4)
Target version:
2.8.0
Start date:
Due date:
% Done:

100%

Estimated time:
Plus Target Version:
24.11
Release Notes:
Default
Affected Version:
Affected Architecture:

Description

I set up a couple of DHCP pools for VLANs on a new Netgate 4200 (running pfsense+ 23.09.1), which is replacing an EdgeRouter-X that had been serving DHCP to the same clients. That went fine, and I watched several of the existing VLAN clients re-acquire their existing addresses from the new server. Then I added another DHCP pool attached directly to the PORT2LAN interface. That completely confused matters for existing leases: the server actively rejected attempts to renew those leases and gave out addresses of its own choosing. Now I am seeing two different entries in the DHCP Leases status page for the same MAC address, which surely should not happen. Digging in the DHCP log entries, it looks like when the server was restarted because of the pool addition, all the lease reloads failed with complaints like

Mar 10 16:09:18 kea-dhcp4 39285 WARN [kea-dhcp4.dhcpsrv.0x401b3c12000] DHCPSRV_LEASE_SANITY_FAIL The lease 10.0.20.41 with subnet-id 2 failed subnet-id checks (the lease should have subnet-id 3).

10.0.20.41 is still shown (though as "down") in the Leases page, but there's also an entry for that client with its forcibly-assigned new IP address.

This isn't a fatal problem, assuming that the server manages to keep re-issuing these newly-chosen addresses, but it's mildly annoying. I'm not sure if there will be any outright conflicts as the remaining clients try to renew their leases.

Related issues

Has duplicate Bug #15735: Kea fails to give out leases after changing DHCP scopeDuplicate

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