#992384 isc-dhcp-client: default domain-search incorrectly appends a period

Package:
isc-dhcp-client
Source:
isc-dhcp
Description:
DHCP client for automatically obtaining an IP address
Submitter:
Martin-Éric Racine
Date:
2025-08-31 07:57:02 UTC
Severity:
important
#992384#5
Date:
2021-08-18 04:40:18 UTC
From:
To:
I added those options to the configuration:

default domain-name "lan";
default domain-search "lan";

What I get as a result:

domain lan
search lan.
nameserver 62.241.198.245
nameserver 62.241.198.246

There is an extraneous period that should not be there.

- -- System Information:
Debian Release: 11.0
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'stable-debug'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.10.0-8-amd64 (SMP w/8 CPU threads)
Locale: LANG=fi_FI.utf8, LC_CTYPE=fi_FI.utf8 (charmap=UTF-8), LANGUAGE=fi:en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages isc-dhcp-client depends on:
ii  debianutils        4.11.2
ii  iproute2           5.10.0-4
ii  libc6              2.31-13
ii  libdns-export1110  1:9.11.19+dfsg-2.1
ii  libisc-export1105  1:9.11.19+dfsg-2.1

Versions of packages isc-dhcp-client recommends:
ii  isc-dhcp-common  4.4.1-2.3

Versions of packages isc-dhcp-client suggests:
pn  avahi-autoipd         <none>
pn  isc-dhcp-client-ddns  <none>
pn  resolvconf            <none>

- -- Configuration Files:
/etc/dhcp/dhclient.conf changed:
option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;
send host-name = gethostname();
request subnet-mask, broadcast-address, time-offset, routers,
	domain-name, domain-name-servers, domain-search, host-name,
	dhcp6.name-servers, dhcp6.domain-search, dhcp6.fqdn, dhcp6.sntp-servers,
	netbios-name-servers, netbios-scope, interface-mtu,
	rfc3442-classless-static-routes, ntp-servers;
default domain-name "lan";
default domain-search "lan";


- -- no debconf information
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#992384#10
Date:
2022-02-21 12:24:28 UTC
From:
To:
As additioal info. it seems that the additional period only appears if
dhclient is called for DHCP-IPv6 (stateful or stateless), such as in
the following /etc/network/interfaces stanza :

iface enp4s0 inet dhcp
iface enp4s0 inet6 auto
  privext 2
  dhcp 1

If the inet6 section is commented out, no extra period appears.

Martin-Éric
#992384#15
Date:
2025-08-31 07:55:18 UTC
From:
To:
Still not fixed as of 4.4.3-P1-1.1:

domain internal
search internal. local.
nameserver 172.16.1.1
nameserver 1.1.1.1