Home / ubuntu / Questions / 1087
Accepted
Mashimom
Asked: 2010-08-06 04:32:05 +0800 CST

How to map a VPN (tun0) network adapter on host Ubuntu to a VirtualBox guest Windows?

  • 772

I have a Ubuntu 10.04 running Oracle VirtualBox 3.2.6 with a Windows XP guest. I use a VPN that I would like to be accessed by the guest VM, on a ifconfig it shows as:

tun0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:5.192.10.99  P-t-P:5.192.10.99  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1362  Metric:1
          RX packets:14151 errors:0 dropped:0 overruns:0 frame:0
          TX packets:19860 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500 
          RX bytes:4415271 (4.4 MB)  TX bytes:17949982 (17.9 MB)

Using NAT or Bridge adapters on the VM only gives me the non-vpn adapter. How can I map the tun0 adapter to VirtualBox?

networking virtualbox

2 Answers

  1. I met the same problem, and googled around but found no answer. at last I found my solution:

    1. in windows, open the VPN connection using VPN GUI.
    2. in VM configuration, add a new Network: Internal network.
    3. restart VM.

    then I can access the resource in VM.

    • 3
  2. Best Answer

    Setting /etc/sysctl.conf: 

    sysctl net.ipv4.ip_forward=1

    Then running: 

    sudo sysctl -p

    (Should not be necessary but) I rebooted after that.

    • 2