I am experiencing exactly the same problem!
here is my log before, while and after I connect to VPN using the
networkmanager. I tested it with a cable connection. It happens ONLY with the
wireless, not with the wired connection.
nadi-laptop:~$ sudo tail -f /var/log/syslog
Feb 13 18:28:04 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 15
seconds.
Feb 13 18:28:04 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:28:19 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:28:19 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:28:19 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 12
seconds.
Feb 13 18:28:19 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:28:31 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:28:31 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:28:31 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:28:31 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 14
seconds.
Feb 13 18:28:45 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:28:45 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:28:45 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 13
seconds.
Feb 13 18:28:45 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:28:58 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:28:58 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:28:58 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 13
seconds.
Feb 13 18:28:58 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:29:11 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:29:11 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:29:11 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 13
seconds.
Feb 13 18:29:11 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:29:24 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:29:24 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:29:24 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 13
seconds.
Feb 13 18:29:24 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:29:37 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:29:37 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:29:37 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:29:37 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 16
seconds.
Feb 13 18:29:53 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:29:53 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:29:53 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:29:53 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 13
seconds.
Feb 13 18:29:59 nadi-laptop NetworkManager: <info> Will activate VPN
connection 'NTNU VPN', service 'org.freedesktop.NetworkManager.vpnc', user_name
'nadi', vpn_data 'IPSec gateway / 129.241.77.40 / IPSec ID / alle / Xauth
username / barc', route ''.
Feb 13 18:29:59 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 1 of 4 (Connection Prepare) scheduled...
Feb 13 18:29:59 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 1 of 4 (Connection Prepare) ran VPN service daemon
org.freedesktop.NetworkManager.vpnc (PID 22538)
Feb 13 18:29:59 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 1 of 4 (Connection Prepare) complete.
Feb 13 18:29:59 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 2 of 4 (Connection Prepare Wait) scheduled...
Feb 13 18:29:59 nadi-laptop kernel: [ 125.478860] tun: Universal TUN/TAP
device driver, 1.6
Feb 13 18:29:59 nadi-laptop kernel: [ 125.478906] tun: (C) 1999-2004 Max
Krasnyansky <m...@qualcomm.com>
Feb 13 18:29:59 nadi-laptop NetworkManager: <info> VPN service
'org.freedesktop.NetworkManager.vpnc' signaled state change 1 -> 6.
Feb 13 18:30:00 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 2 of 4 (Connection Prepare Wait) waiting...
Feb 13 18:30:00 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 2 of 4 (Connection Prepare Wait) complete.
Feb 13 18:30:00 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 3 of 4 (Connect) scheduled...
Feb 13 18:30:00 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 3 of 4 (Connect) sending connect request.
Feb 13 18:30:00 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 3 of 4 (Connect) request sent, waiting for reply...
Feb 13 18:30:00 nadi-laptop NetworkManager: <info> VPN service
'org.freedesktop.NetworkManager.vpnc' signaled state change 6 -> 3.
Feb 13 18:30:00 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 3 of 4 (Connect) reply received.
Feb 13 18:30:00 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 4 of 4 (IP Config Get) timeout scheduled...
Feb 13 18:30:00 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 3 of 4 (Connect) complete, waiting for IP configuration...
Feb 13 18:30:00 nadi-laptop kernel: [ 125.561803] tun0: Disabled Privacy
Extensions
Feb 13 18:30:02 nadi-laptop vpnc[22545]: can't open pidfile /var/run/vpnc/pid
for writing
Feb 13 18:30:02 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 4 of 4 (IP Config Get) reply received.
Feb 13 18:30:03 nadi-laptop NetworkManager: <info> Clearing nscd hosts cache.
Feb 13 18:30:03 nadi-laptop NetworkManager: <WARN> nm_spawn_process():
nm_spawn_process('/usr/sbin/nscd -i hosts'): could not spawn process. (Failed
to execute child process "/usr/sbin/nscd" (No such file or directory))
Feb 13 18:30:03 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
Stage 4 of 4 (IP Config Get) complete.
Feb 13 18:30:03 nadi-laptop NetworkManager: <info> VPN Activation (NTNU VPN)
successful.
Feb 13 18:30:03 nadi-laptop NetworkManager: <info> VPN service
'org.freedesktop.NetworkManager.vpnc' signaled state change 3 -> 4.
Feb 13 18:30:06 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:30:06 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:30:06 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:30:06 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 14
seconds.
Feb 13 18:30:20 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:30:20 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:30:20 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 15
seconds.
Feb 13 18:30:20 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
^[[5~Feb 13 18:30:35 nadi-laptop dhclient: DHCPREQUEST of <null address> on
wlan0 to 10.0.0.1 port 67
Feb 13 18:30:35 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:30:35 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:30:35 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 15
seconds.
Feb 13 18:30:50 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:30:50 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:30:50 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:30:50 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 13
seconds.
Feb 13 18:31:03 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:31:03 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:31:03 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:31:03 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 16
seconds.
^TFeb 13 18:31:19 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0
to 10.0.0.1 port 67
Feb 13 18:31:19 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:31:19 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:31:19 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 15
seconds.
Feb 13 18:31:24 nadi-laptop NetworkManager: <info> Will deactivate the VPN
connection 'NTNU VPN', service 'org.freedesktop.NetworkManager.vpnc'.
Feb 13 18:31:24 nadi-laptop NetworkManager: <info> Clearing nscd hosts cache.
Feb 13 18:31:24 nadi-laptop NetworkManager: <WARN> nm_spawn_process():
nm_spawn_process('/usr/sbin/nscd -i hosts'): could not spawn process. (Failed
to execute child process "/usr/sbin/nscd" (No such file or directory))
Feb 13 18:31:24 nadi-laptop avahi-daemon[5148]: Withdrawing address record for
10.0.0.5 on wlan0.
Feb 13 18:31:24 nadi-laptop avahi-daemon[5148]: Leaving mDNS multicast group on
interface wlan0.IPv4 with address 10.0.0.5.
Feb 13 18:31:24 nadi-laptop avahi-daemon[5148]: Interface wlan0.IPv4 no longer
relevant for mDNS.
Feb 13 18:31:24 nadi-laptop avahi-daemon[5148]: Withdrawing address record for
fe80::21d:e0ff:fe1b:5355 on wlan0.
Feb 13 18:31:24 nadi-laptop avahi-daemon[5148]: Joining mDNS multicast group on
interface wlan0.IPv4 with address 10.0.0.5.
Feb 13 18:31:24 nadi-laptop avahi-daemon[5148]: New relevant interface
wlan0.IPv4 for mDNS.
Feb 13 18:31:24 nadi-laptop avahi-daemon[5148]: Registering new address record
for 10.0.0.5 on wlan0.IPv4.
Feb 13 18:31:25 nadi-laptop vpnc[22545]: select: Interrupted system call
Feb 13 18:31:25 nadi-laptop NetworkManager: <info> VPN service
'org.freedesktop.NetworkManager.vpnc' signaled state change 4 -> 5.
Feb 13 18:31:25 nadi-laptop NetworkManager: <info> VPN service
'org.freedesktop.NetworkManager.vpnc' signaled state change 5 -> 6.
Feb 13 18:31:25 nadi-laptop vpnc[22545]: terminated by signal: 15
Feb 13 18:31:34 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0 to
10.0.0.1 port 67
Feb 13 18:31:34 nadi-laptop dhclient: DHCPACK of 10.0.0.5 from 10.0.0.1
Feb 13 18:31:34 nadi-laptop dhclient: bound to 10.0.0.5 -- renewal in 13
seconds.
Feb 13 18:31:34 nadi-laptop NetworkManager: <info> DHCP daemon state is now 3
(renew) for interface wlan0
Feb 13 18:31:47 nadi-laptop dhclient: DHCPREQUEST of <null address> on wlan0
--
VPN connection in Network Manager looses DNS server with DHCP renew of parent
connection.
https://bugs.launchpad.net/bugs/255480
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