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

Perry Halbert phalbert at cox.net
Wed May 11 14:41:39 GMT 2011


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.


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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