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virtualbox-nat-with-cisco-vpn-gotchas.md

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Problem

When using oracle virtualbox, it is desirable to deploy linux guest on a windows host with NAT enabled (instead of bridge or other network configurations). This allows guest to use host's internet connection (including VPN). But,

  • You can't access guest from any network outside of host's internal network
  • Virtualbox seems to have a glitch, where-in if host uses cisco VPN and the VPN is enabled, guest fails to access outside world

Solution

  • For 1st problem, just set up port forwarding using VboxManage.exe, like so:

    "C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" modifyvm "VM name" --natpf1 "ssh,tcp,,8022,,22"

  • For 2nd problem, this works:

    "C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" modifyvm "VM name" --natdnshostresolver1 on

Guest needs to be powered off before exercising the commands mentioned above.