[vbox-dev] VirtualBox blocks 127/8 (loopback) subnets for intnet

Alexey Eromenko al4321 at gmail.com
Tue Dec 1 15:17:49 GMT 2015

>The MAC address of the interfaces have not changed.

Some applications do use multiple virtual MAC addresses (like GNS3 -
Graphical Network Simulator).
So maybe yours is affected.

On Tue, Dec 1, 2015 at 5:15 PM,  <george.vargh at wipro.com> wrote:
> Hi Alexey,
>  The MAC address of the interfaces have not changed.
>  It looks like there is some filtering in VirtualBox in the receive path to filter 127.x.x.x IP address before it reaches the Ethernet device emulation in VM.
> Best Regards
>  George
> -----Original Message-----
> From: Alexey Eromenko [mailto:al4321 at gmail.com]
> Sent: 01 December 2015 18:54
> To: Gianfranco Costamagna <costamagnagianfranco at yahoo.it>
> Cc: vbox-dev at virtualbox.org
> Subject: Re: [vbox-dev] VirtualBox blocks 127/8 (loopback) subnets for intnet
> One major difference between old VirtualBox and new one is at the MAC level filtering at layer 2.
> To achieve network similar to VirtualBox 2.x, you need:
> VM->Settings->Network->Adapter [X]->Advanced->Promisc. Mode = "Allow All".
> If your application used to work with VBox 2.x, it will work with v5.x and this setting.
> Best wishes,
> -Technologov
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-Alexey Eromenko "Technologov"

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