[pkg-dhcp-devel] Bug#773749: isc-dhcp-client: no longer updates /etc/resolv.conf

Vincent Lefevre vincent at vinc17.net
Mon Dec 22 21:38:36 UTC 2014

Package: isc-dhcp-client
Version: 4.3.1-5
Severity: grave
Justification: renders package unusable
[Well, correction can be done manually, but this is really annoying.]

I've been using wicd to connect via WiFi for years, and this has
always worked, but now the /etc/resolv.conf file is no longer
updated. The /etc/wicd/dhclient.conf.template file is used by
wicd and contains here (this is the default + the prepend line):

# If you're reading this, you're probably reading either:
#  /etc/wicd/dhclient.conf.template.default
# or
#  /etc/wicd/dhclient.conf.template
# or
#  a generated dhclient configuration in /var/run
# (these files could be in different locations, as determined by your
# packager or system administrator, but those are the default pathes)
# Here's what you need to know:
#  The .default file is copied by wicd to dhclient.conf.template if
#  dhclient.conf.template does not exist. If dhclient.conf.template
#  does exist, the .default file is not used. This is to allow
#  upgrades of the package without destroying user changes.
#  In other words, if you want to change the generated dhclient
#  configuration, you need to change dhclient.conf.template,
#  NOT dhclient.conf.template.default

# wicd will replace $_HOSTNAME in the following line with
# the appropriate hostname for this system
send host-name "$_HOSTNAME";

# Prepend the local DNS server (BIND), but also Google DNS servers,
# as BIND times out on network congestion.
prepend domain-name-servers,,;

As you can see, there is a prepend line, but the /etc/resolv.conf
file was still unmodified (last modified on 2014-09-30 00:39:52),
with incorrect settings ("nameserver" only). I had to
modify it manually.

/var/log/syslog says about dhclient:

Dec 22 21:39:18 xvii dhclient: Internet Systems Consortium DHCP Client 4.3.1
Dec 22 21:39:18 xvii dhclient: Copyright 2004-2014 Internet Systems Consortium.
Dec 22 21:39:18 xvii dhclient: All rights reserved.
Dec 22 21:39:18 xvii dhclient: For info, please visit https://www.isc.org/software/dhcp/
Dec 22 21:39:18 xvii dhclient: 
Dec 22 21:39:18 xvii dhclient: Listening on LPF/wlan0/00:21:6a:47:b3:80
Dec 22 21:39:18 xvii dhclient: Sending on   LPF/wlan0/00:21:6a:47:b3:80
Dec 22 21:39:18 xvii dhclient: Sending on   Socket/fallback
Dec 22 21:39:18 xvii dhclient: DHCPDISCOVER on wlan0 to port 67 interval 8
Dec 22 21:39:20 xvii dhclient: DHCPREQUEST on wlan0 to port 67
Dec 22 21:39:20 xvii dhclient: DHCPOFFER from
Dec 22 21:39:20 xvii dhclient: DHCPACK from
Dec 22 21:39:20 xvii dhclient: bound to -- renewal in 124409 seconds.

Note: resolvconf is installed, but the files in the /etc/resolvconf
directory have old timestamps:

-rw-r--r-- 1  481 2013-02-06 20:55:06 interface-order
-rw-r--r-- 1    0 2012-09-10 11:55:45 resolv.conf.d/base
-rw-r--r-- 1  151 2012-09-10 11:55:45 resolv.conf.d/head
-rw-r--r-- 1   72 2012-10-21 13:51:50 resolv.conf.d/original
-rw-r--r-- 1    0 2012-10-21 14:45:20 resolv.conf.d/tail
lrwxrwxrwx 1   15 2012-10-21 14:45:12 run -> /run/resolvconf/
-rwxr-xr-x 1  249 2009-01-28 03:59:31 update-libc.d/avahi-daemon*
-rwxr-xr-x 1  426 2012-04-27 17:54:50 update-libc.d/postfix*
-rwxr-xr-x 1 3195 2012-09-10 11:55:45 update.d/dnscache*
-rwxr-xr-x 1 4624 2013-02-06 20:55:06 update.d/libc*

thus have not been modified for a long time.

/run/resolvconf/resolv.conf was modified on 2014-12-22 21:39:20 and
contains correct settings:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

but isn't taken into account, since /etc/resolv.conf is not a symlink
to it (I don't know why, but it was a symlink in the past).

So, it appears that dhclient modifies the wrong file.

-- System Information:
Debian Release: 8.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/2 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages isc-dhcp-client depends on:
ii  debianutils       4.4+b1
ii  iproute2          3.16.0-2
ii  isc-dhcp-common   4.3.1-5
ii  libc6             2.19-13
ii  libdns-export100  1:9.9.5.dfsg-7
ii  libirs-export91   1:9.9.5.dfsg-7
ii  libisc-export95   1:9.9.5.dfsg-7

isc-dhcp-client recommends no packages.

Versions of packages isc-dhcp-client suggests:
ii  avahi-autoipd  0.6.31-4+b2
ii  resolvconf     1.76

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

-- no debconf information

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