Below are three connection attempts which failed the first time to
properly connect to the VPN-server. Most often the default route is not
set properly and when hung up not all routing entries were always
deleted.

The pptp-plugin reported every time that the connection succeeded.

patrik@ubuntu:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
213.232.200.166 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
1.2.96.1        0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0
0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0 wlan0
patrik@ubuntu:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
213.232.200.166 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
1.2.96.1        0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0
0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0 ppp0
patrik@ubuntu:~$ 

patrik@ubuntu:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
213.232.200.166 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.166 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
1.254.6.14      0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0
patrik@ubuntu:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
213.232.200.166 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.166 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
1.2.96.1        0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0
0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0 ppp0


patrik@ubuntu:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
1.254.6.14      0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0
patrik@ubuntu:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
213.232.200.166 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.166 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
213.232.200.200 192.168.0.1     255.255.255.255 UGH   0      0        0 wlan0
1.2.96.1        0.0.0.0         255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     0.0.0.0         255.255.255.0   U     2      0        0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 wlan0
0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0 ppp0
patrik@ubuntu:~$

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https://bugs.launchpad.net/bugs/113622

Title:
  PPTP plugin for network manager sets wrong routing table entries

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