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Maniphest T7823

DHCP-server lease cannot be cleared
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Description

DHCP-server lease cannot be cleared:

set interfaces ethernet eth2 address '100.64.2.1/24'
set service dhcp-server listen-interface 'eth2'
set service dhcp-server shared-network-name LANv42 authoritative
set service dhcp-server shared-network-name LANv42 subnet 100.64.2.0/24 range R1 option default-router '100.64.2.1'
set service dhcp-server shared-network-name LANv42 subnet 100.64.2.0/24 range R1 option name-server '1.1.1.1'
set service dhcp-server shared-network-name LANv42 subnet 100.64.2.0/24 range R1 start '100.64.2.10'
set service dhcp-server shared-network-name LANv42 subnet 100.64.2.0/24 range R1 stop '100.64.2.254'
set service dhcp-server shared-network-name LANv42 subnet 100.64.2.0/24 subnet-id '1'

check:

vyos@r14:~$ show dhcp server leases 
IP Address    MAC address        State    Lease start                Lease expiration           Remaining    Pool    Hostname    Origin
------------  -----------------  -------  -------------------------  -------------------------  -----------  ------  ----------  --------
100.64.2.10   52:54:00:96:17:74  active   2025-09-15 10:47:13+00:00  2025-09-16 10:47:13+00:00  23:57:02     LANv42  r15         local
100.64.2.11   52:54:00:09:0b:01  active   2025-09-15 10:47:28+00:00  2025-09-16 10:47:28+00:00  23:57:17     LANv42  r15         local
vyos@r14:~$ 
vyos@r14:~$ 
vyos@r14:~$ clear dhcp-server lease 100.64.2.10
Failed to clear lease for "100.64.2.10"
vyos@r14:~$ 
vyos@r14:~$ clear dhcp-server lease 100.64.2.11
Failed to clear lease for "100.64.2.11"
vyos@r14:~$ 
vyos@r14:~$ 
vyos@r14:~$ show dhcp server leases 
IP Address    MAC address        State    Lease start                Lease expiration           Remaining    Pool    Hostname    Origin
------------  -----------------  -------  -------------------------  -------------------------  -----------  ------  ----------  --------
100.64.2.10   52:54:00:96:17:74  active   2025-09-15 10:47:13+00:00  2025-09-16 10:47:13+00:00  23:56:52     LANv42  r15         local
100.64.2.11   52:54:00:09:0b:01  active   2025-09-15 10:47:28+00:00  2025-09-16 10:47:28+00:00  23:57:07     LANv42  r15         local
vyos@r14:~$

Checked on VyOS 2025.09.10-0018-rolling with manual changes in https://github.com/vyos/vyos-1x/pull/4689
So it doesn't resolve the clear release issue.

Details

Version
VyOS 2025.09.10-0018-rolling
Is it a breaking change?
Perfectly compatible
Issue type
Bug (incorrect behavior)

Related Objects
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StatusSubtypeAssignedTask
 ResolvedFEATURE REQUESTdavi2367T6211 VRF support for Kea-based DHCP server
 ResolvedBUGcanoziiaT7823 DHCP-server lease cannot be cleared

Event Timeline

Viacheslav created this task.Sep 15 2025, 11:01 AM
Viacheslav triaged this task as Normal priority.
Viacheslav added a parent task: T6211: VRF support for Kea-based DHCP server.
Viacheslav mentioned this in T6211: VRF support for Kea-based DHCP server.
factor2431 mentioned this in T7831: Clear DHCP lease failing.Sep 16 2025, 8:05 PM
factor2431 subscribed.
admin@vyos:~$ clear dhcp-server lease 192.168.31.100
usage: dhcp.py clear_dhcp_server_lease [-h] --family {inet,inet6} --vrf VRF --address ADDRESS
dhcp.py clear_dhcp_server_lease: error: the following arguments are required: --vrf
pasik subscribed.Sep 17 2025, 6:25 AM
canoziia subscribed.Sep 22 2025, 2:28 PM

The problem is caused by inconsistent parameter ordering: in def kea_delete_lease(inet, ip_address, vrf_name=''): permalink the vrf_name is placed after ip_address, while in if not kea_delete_lease(inet, vrf, address): permalink the vrf appears before the address.

I will open a pull request to fix it.

canoziia added a comment.Sep 22 2025, 2:56 PM

PR: https://github.com/vyos/vyos-1x/pull/4741

Viacheslav assigned this task to canoziia.Sep 22 2025, 6:32 PM
Restricted Repository Identity mentioned this in rVYOSONEX3a5947fb673a: kea: T7823: DHCP-server lease cannot be cleared.Oct 2 2025, 2:28 PM
factor2431 added a comment.Oct 16 2025, 1:14 AM

Confirmed fixed in v2025.10.12-0019-rolling

Viacheslav closed this task as Resolved.Oct 16 2025, 10:16 AM
Viacheslav moved this task from Need Triage to Completed on the VyOS Rolling board.
dmbaturin added a project: VyOS 1.5 Circinus (1.5-stream-2025-Q3).Nov 3 2025, 10:13 AM
dmbaturin changed Is it a breaking change? from Unspecified (possibly destroys the router) to Perfectly compatible.
Viacheslav moved this task from Open to Finished on the VyOS 1.5 Circinus (1.5-stream-2025-Q3) board.Nov 3 2025, 11:42 AM