Public bug reported:
in /etc/default/isc-dhcp-server describe two options
# cat /etc/default/isc-dhcp-server
....
# On what interfaces should the DHCP server (dhcpd) serve DHCP requests?
# Separate multiple interfaces with spaces, e.g. "eth0 eth1".
INTERFACESv4=""
INTERFACESv6=""
But in systemctl unit files used old option, without v4/v6 suffixes
# systemctl cat isc-dhcp-server6.service
.....
exec dhcpd -user dhcpd -group dhcpd -f -6 -pf /run/dhcp-server/dhcpd6.pid
-cf $CONFIG_FILE $INTERFACES'
Fix is very quick ;)
s/INTERFACES/INTERFACESv4/ in isc-dhcp-server.service
s/INTERFACES/INTERFACESv6/ in isc-dhcp-server6.service
Or as workaround add old INTERFACES="" to /etc/default/isc-dhcp-server
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: isc-dhcp-server 4.4.1-2ubuntu5
ProcVersionSignature: Ubuntu 5.3.0-26.28-generic 5.3.13
Uname: Linux 5.3.0-26-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
Date: Wed Jan 22 12:51:26 2020
InstallationDate: Installed on 2020-01-18 (3 days ago)
InstallationMedia: Ubuntu-Server 19.10 "Eoan Ermine" - Release amd64 (20191017)
ProcEnviron:
SHELL=/bin/bash
LANG=en_US.UTF-8
TERM=xterm-256color
PATH=(custom, no user)
SourcePackage: isc-dhcp
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.dhcp.dhcpd.conf: [modified]
modified.conffile..etc.dhcp.dhcpd6.conf: [modified]
mtime.conffile..etc.dhcp.dhcpd.conf: 2020-01-19T14:25:59.040443
mtime.conffile..etc.dhcp.dhcpd6.conf: 2020-01-19T16:28:31.017125
** Affects: isc-dhcp (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug eoan uec-images
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https://bugs.launchpad.net/bugs/1860549
Title:
isc-dhcp server not use configuration file options
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