Page MenuHomeVyOS Platform
Create Task
Maniphest T2737

DHCP Lease not displayed with a static map
Closed, ResolvedPublicBUG
Actions

Description

When we use static mapping for DHCP-server, it not display the lease.
Server side:

set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 default-router '10.0.0.1'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 dns-server '10.0.0.1'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 lease '86400'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 range 0 start '10.0.0.100'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 range 0 stop '10.0.0.199'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 static-mapping myPC ip-address '10.0.0.130'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 static-mapping myPC mac-address '52:54:00:a9:98:2c'

Show leases:

vyos@r1-roll:~$ show dhcp server leases 
IP address    Hardware address    State    Lease start    Lease expiration    Remaining    Pool    Hostname
------------  ------------------  -------  -------------  ------------------  -----------  ------  ----------
vyos@r1-roll:~$

R2 client side

vyos@r2-roll# run show int | match eth1
eth1             10.0.0.130/24                     u/u

Delete static mapping:

vyos@r1-roll# delete service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 static-mapping myPC 
[edit]
vyos@r1-roll# commit

Reassign ip on the client-side:

delete interfaces ethernet eth1 address dhcp 
commit

set interfaces ethernet eth1 address dhcp
commit

vyos@r2-roll# run show int | match eth1
eth1             10.0.0.130/24                     u/u 
[edit]
vyos@r2-roll#

Chek leases on the server side:

vyos@r1-roll# run show dhcp server leases 
IP address    Hardware address    State    Lease start          Lease expiration     Remaining    Pool    Hostname
------------  ------------------  -------  -------------------  -------------------  -----------  ------  ----------
10.0.0.130    52:54:00:a9:98:2c   active   2020/07/27 15:42:17  2020/07/28 15:42:17  23:58:56     LAN     r2-roll

Details

Version
VyOS 1.3-rolling-202007270117
Is it a breaking change?
Perfectly compatible
Issue type
Bug (incorrect behavior)

Event Timeline

Viacheslav created this task.Jul 27 2020, 3:49 PM
dmbaturin subscribed.Jul 29 2021, 12:51 PM

It's a known limitation of the ISC DHCPD. It treats static leases completely differently from dynamic ones.

dmbaturin edited projects, added VyOS 1.4 Sagitta; removed VyOS 1.3 Equuleus.Jul 29 2021, 12:51 PM
eronlloyd subscribed.Feb 21 2022, 10:59 AM
a.hajiyev subscribed.Nov 20 2023, 6:30 AM

Tested in VyOS 1.4-rolling-202311100309:
Configurations:

set interfaces ethernet eth0 address '10.0.0.130/24'

set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 default-router '10.0.0.1'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 lease '86400'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 name-server '10.0.0.1'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 range 0 start '10.0.0.100'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 range 0 stop '10.0.0.199'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 static-mapping myPC ip-address '10.0.0.110'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 static-mapping myPC mac-address '00:50:79:66:68:00'

Behavior is the same:

sh dhcp server leases
IP Address    MAC address    State    Lease start    Lease expiration    Remaining    Pool    Hostname
------------  -------------  -------  -------------  ------------------  -----------  ------  ----------

Deleting the static mapping:

delete service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 static-mapping myPC
commit

Reassigning the IP to the PC (client).
Checking on the VyOS side:

show dhcp server leases
IP Address    MAC address        State    Lease start          Lease expiration     Remaining    Pool    Hostname
------------  -----------------  -------  -------------------  -------------------  -----------  ------  ----------
10.0.0.100    00:50:79:66:68:00  active   2023/11/20 06:24:37  2023/11/21 06:24:37  23:59:26     LAN     PC1

After the deletion of the static mapping, VyOS shows the leases

n.fort changed the task status from Open to In progress.Nov 28 2023, 2:51 PM
n.fort added a project: VyOS 1.5 Circinus.
n.fort set Issue type to Unspecified (please specify).
pasik subscribed.Nov 28 2023, 4:54 PM
n.fort changed the task status from In progress to Confirmed.Nov 28 2023, 5:03 PM
JeffWDH subscribed.Nov 28 2023, 5:20 PM
dmbaturin triaged this task as Normal priority.Jan 9 2024, 5:02 PM
sarthurdev removed a project: VyOS 1.5 Circinus.Feb 13 2024, 10:49 AM
sarthurdev subscribed.

Not an issue on 1.5 with Kea.

dmbaturin edited projects, added VyOS 1.5 Circinus; removed VyOS 1.4 Sagitta.Feb 15 2024, 11:31 AM
dmbaturin added a comment.Apr 4 2024, 9:44 PM

It all works in Kea now, right? Can we close the task?

dmbaturin added a project: Restricted Project.Sep 16 2024, 4:16 PM
dmbaturin changed the task status from Confirmed to Needs testing.Oct 14 2024, 10:21 AM
dmbaturin edited projects, added VyOS Rolling; removed Restricted Project.
dmbaturin edited a custom field.
dmbaturin changed Is it a breaking change? from Unspecified (possibly destroys the router) to Perfectly compatible.
dmbaturin changed Issue type from Unspecified (please specify) to Bug (incorrect behavior).
vyosbot added a project: Bugs.Oct 14 2024, 11:32 AM
Viacheslav closed this task as Resolved.Sep 25 2025, 3:49 AM
Viacheslav claimed this task.
Viacheslav moved this task from Need Triage to Completed on the VyOS Rolling board.

Fixed, checked in the stream-q2

vyos@r15# run show conf com | match dhcp
set interfaces pppoe pppoe1 dhcpv6-options pd 1 interface dum1
set interfaces pppoe pppoe2 dhcpv6-options pd 1 interface dum2
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 lease '86400'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 range 0 start '10.0.0.100'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 range 0 stop '10.0.0.199'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 static-mapping myPC ip-address '10.0.0.130'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 static-mapping myPC mac '52:54:00:28:23:f1'
set service dhcp-server shared-network-name LAN subnet 10.0.0.0/24 subnet-id '10'
[edit]
vyos@r15# 
[edit]
vyos@r15# run show dhcp server leases 
IP Address    MAC address        State    Lease start                Lease expiration           Remaining    Pool    Hostname    Origin
------------  -----------------  -------  -------------------------  -------------------------  -----------  ------  ----------  --------
10.0.0.130    52:54:00:28:23:f1  active   2025-09-25 03:47:47+00:00  2025-09-26 03:47:47+00:00  23:59:28     LAN     mypc        local
[edit]
vyos@r15# 
[edit]
vyos@r15# 
[edit]
vyos@r15# run show ver
Version:          VyOS 1.5-stream-2025-Q2
Release train:    circinus
Release flavor:   generic
Viacheslav moved this task from Open to Finished on the VyOS 1.5 Circinus board.Sep 25 2025, 3:49 AM