[vbox-dev] [PATCH] UDPTunnel : new network interface backend to allow using this to link to GNS3 and QEMU instances over the network

[Christophe Devriese]

Well this is unfortunately not possible. Extension packs cannot make use of
the API, they cannot provide support in the UI, nor in the VBoxManage tool.
So if one wants a somewhat usable solution, it can't be done with an
extension pack.

With this patch you *do* have the choice of having this or not. In fact, you
have to use the --enable-udptunnel configure parameter. So this is on par
with VDE on that point also.

--
Christophe

On Wed, May 11, 2011 at 4:41 PM, Perry Halbert <phalbert at cox.net> wrote:

>  Question,
>
> Why not put this in an Extension Pack as an addon instead of changing the
> base code for everyone?
>
> Myself I like the idea of being able to either have this or not. Seems to
> me that is one reason that the Ext. Pack was implemented.  What about the
> security of the added UDP protocol such as three-way handshake that is
> missing in UDP used for the validity of the claimed source address.  I know
> that all of this seems small but to rush to change the base without
> considering the underlaying issues seems wrong.
>
> If the decision is to include this in the base then there should also be a
> way to disable it built in as well.
>
> Perry
>
>
>
>
> On 05/11/2011 03:02 AM, Nikolay Igotti wrote:
>
>       Hello,
>
>  Idea of patch is nice, but what I don't understand is how do you implement
> reliable ethernet
> (as carrier collision and packet retransmit in real hardware is performed
> by the NIC) transport over
> potentially unreliable UDP (no guarantees on delivery or frames ordering).
> Cursory look shown no
> code for retransmit or attempts to handle ordering issue in patch.
>
> At least some explanations how do you expect that to work, and tests how
> this whole feature behaves
> in heavily contended networks would be nice.
>
>    Nikolay.
>
> On 5/11/11 3:11 AM, Alexey Eromenko wrote:
>
> A letter to community:
>
> UDP Tunnel networking
> ---------------------
>
> UDP tunnel is a great mechanism to interconnect virtual machines
> running on different hosts. It is intended for advanced users.
>
> Technically this is done by encapsulating guest's ethernet frames into
> host's UDP/IP packets, and sending them to the destination. This
> tunnel is a sort of VPN, except that UDP tunnel is not encrypted.
>
> ----------------------------
>
> This feature will enable GNS3 network simulator to work perfectly
> together with VirtualBox.
> GNS3 allows to build clouds and distributed network topologies in very
> nice graphical way, where you can actually *draw* network topology,
> and interconnect VMs together, even if they run on different physical
> hosts. GNS3 is very user friendly.
>
> So you all are encouraged to test UDP tunnels, and report your findings.
>
> Best wishes,
>
>
>
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