Public bug reported:

Ubuntu: oineric 11.10
network-manager: 0.9.1.90-0ubuntu5.1

The problem is when using any VPN client from network-manager and
consists of not being able to connect from the external net through port
forwarding.

Internal IP->local computer (works)
VPN IP->local computer (works)
Local computer->internal network (works)
Local computer->vpn->internet (works)
Ext IP->[port forwarding]->local computer (does not work)


When using openvpn I get the following routing table (VPN adresses hidden):

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         X.X.X.X         0.0.0.0         UG    0      0        0 tap0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth1
X.X.X.X         0.0.0.0         255.255.255.0   U     0      0        0 tap0
X.X.X.X         192.168.0.1     255.255.255.255 UGH   0      0        0 eth1
192.168.0.0     0.0.0.0         255.255.255.0   U     1      0        0 eth1

Solution (External IP Y.Y.Y.Y):

$ route add -host Y.Y.Y.Y gw 192.168.0.1 dev eth1


Now we can reach the computer on both Y.Y.Y.Y and the vpn ip.

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/916062

Title:
  network-manager should ad route to external ip when using vpn (w.
  solution)

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