[Pkg-utopia-maintainers] Bug#811218: network-manager overwrites /etc/resolv.conf when a DHCPv6 lease is renewed

[Enrique Garcia]

Package: network-manager
Version: 0.9.10.0-7
Severity: normal
Tags: ipv6
     
 I have defined the following NetworkManager wired connection:

[ethernet]
duplex=full

[connection]
id=Wired connection 1
type=ethernet

[ipv6]
method=auto
dns=2a00:e10:1000:10:4386:102:67:53;
ip6-privacy=1

[ipv4]
method=auto
dns=78.138.102.67;

 Before connecting to the network the /etc/resolv.conf looks like:
$ cat /etc/resolv.conf 
# Generated by NetworkManager

 Just after connecting to the network the file looks like:
$ cat /etc/resolv.conf 
# Generated by NetworkManager
search cm.cablesurf.de cm.cablesurf.de.
nameserver 195.234.128.12
nameserver 195.234.128.9
nameserver 78.138.102.67
# NOTA: el resolutor de nombres de libc puede que no soporte más de 3 
servidores de nombres.
# Puede que los servidores de nombres listados abajo no se reconozcan.
nameserver 2001:4c50:6:4000::12
nameserver 2001:4c50:6:4000::16
nameserver 2a00:e10:1000:10:4386:102:67:53

 This is just fine, but only 10 seconds after that the file now looks like:
$ cat /etc/resolv.conf 
nameserver 2001:4c50:6:4000::12
nameserver 2001:4c50:6:4000::16

 and the IPv4 server has dissapeared together with the custom additional 
 nameservers.

 Looking at journalctl I can see that this happens just after NetworkManager
 renews the DHCPv6 leasing:
ene 16 22:14:19  NetworkManager[799]: <info>   domain search 
'cm.cablesurf.de.'
ene 16 22:14:19  NetworkManager[799]: <info>   nameserver 
'2001:4c50:6:4000::16'
ene 16 22:14:19  NetworkManager[799]: <info>   nameserver 
'2001:4c50:6:4000::12'
ene 16 22:14:19  NetworkManager[799]: <info>   address 
2001:4c50:2cd:1400:5e26:aff:fe7e:b485
ene 16 22:14:19  NetworkManager[799]: <info>   preferred_lft 30
ene 16 22:14:19  NetworkManager[799]: <info>   valid_lft 60
ene 16 22:14:19  NetworkManager[799]: <info> (eth0): DHCPv6 state changed 
renew6 -> renew6
ene 16 22:14:19  dhclient[32373]: RCV: Reply message on eth0 from 
fe80::c627:95ff:feb0:f03.
ene 16 22:14:19  dhclient[32373]: XMT: Renew on eth0, interval 9520ms.
ene 16 22:14:19  dhclient[32373]: PRC: Renewing lease on eth0.

 The DHCPv4 leasing is on the other hand every 100000 seconds, which is the 
 value I set up in my router. For some reason the router doesn´t honor
 that value for IPv6 leases.

 The fact that NetworkManager modifies the DNS resolver is causing problems
 since the IPv6 resolvers are much slower and I loose the custom resolvers.



-- System Information:
Debian Release: 8.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=es_ES.utf8, LC_CTYPE=es_ES.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages network-manager depends on:
ii  adduser                3.113+nmu3
ii  dbus                   1.8.20-0+deb8u1
ii  init-system-helpers    1.22
ii  isc-dhcp-client        4.3.1-6
ii  libc6                  2.19-18+deb8u1
ii  libdbus-1-3            1.8.20-0+deb8u1
ii  libdbus-glib-1-2       0.102-1
ii  libgcrypt20            1.6.3-2
ii  libglib2.0-0           2.42.1-1
ii  libgnutls-deb0-28      3.3.8-6+deb8u3
ii  libgudev-1.0-0         215-17+deb8u2
ii  libmm-glib0            1.4.0-1
ii  libndp0                1.4-2
ii  libnewt0.52            0.52.17-1+b1
ii  libnl-3-200            3.2.24-2
ii  libnl-genl-3-200       3.2.24-2
ii  libnl-route-3-200      3.2.24-2
ii  libnm-glib4            0.9.10.0-7
ii  libnm-util2            0.9.10.0-7
ii  libpam-systemd         215-17+deb8u2
ii  libpolkit-gobject-1-0  0.105-8
ii  libreadline6           6.3-8+b3
ii  libsoup2.4-1           2.48.0-1
ii  libsystemd0            215-17+deb8u2
ii  libteamdctl0           1.12-2
ii  libuuid1               2.25.2-6
ii  lsb-base               4.1+Debian13+nmu1
ii  policykit-1            0.105-8
ii  udev                   215-17+deb8u2
ii  wpasupplicant          2.3-1+deb8u3

Versions of packages network-manager recommends:
ii  crda            3.13-1
ii  dnsmasq-base    2.72-3+deb8u1
ii  iptables        1.4.21-2+b1
ii  iputils-arping  3:20121221-5+b2
ii  modemmanager    1.4.0-1
ii  ppp             2.4.6-3.1

Versions of packages network-manager suggests:
ii  avahi-autoipd  0.6.31-5
pn  libteam-utils  <none>

-- no debconf information