#849378 IPv6: dhclient: ignores supersede, append and prepend

Package:
isc-dhcp-client
Source:
isc-dhcp
Description:
DHCP client for automatically obtaining an IP address
Submitter:
Daniel Pocock
Date:
2026-08-05 17:34:05 UTC
Severity:
normal
#849378#5
Date:
2016-12-26 13:00:39 UTC
From:
To:
I'm running dual stack IPv4 and IPv6

The Debian (client) machine has NM disabled

/etc/network/interfaces:

iface eth0 inet dhcp
iface eth0 inet6 dhcp
	accept_ra 1



The DHCPv6 server only sends one search domain but I want to use two
search domains.

I tried adding both of them in /etc/dhcp/dhclient.conf using supersede,
append or prepend, all of those options appear to be ignored, e.g.

append domain-search "subdomain1.example.org", "subdomain2.example.org";
append dhcp6.domain-search "subdomain1.example.org",
"subdomain2.example.org";

has no effect.



If I run the dhclient manually, I notice these directives work correctly
for IPv4

I used strace to verify that the IPv6 instance of dhclient is definitely
reading /etc/dhcp/dhclient.conf

The DHCPv6 server only sends subdomain1.example.org but that is the
problem I'm trying to workaround by using supersede, appaned or prepend

I tried running dhclient with "-v -d" and also looking at syslog and
journalctl and couldn't find any hints about it ignoring or rejecting
these search parameters.

#849378#12
Date:
2026-08-05 17:31:09 UTC
From:
To:
Dear submitter,

as the package isc-dhcp has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1143544

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)