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

Gianfranco Costamagna costamagnagianfranco at yahoo.it
Tue Dec 1 13:14:27 UTC 2015


Hi,


>Use 10.0.0.0/8 if you need such a big subnet, else go with
>   172.16.0.0/12 or 192.168.0.0/16


mmm I guess it is 172.16.0.0/16 and 192.168.0.0/24 ;)

cheers,

G.

On 01/12/15 13:43, george.vargh at wipro.com wrote:

Hi,
 
We are having our test topology running multiple VMs on a server.
The guest VMs are linux based and the host is based on RHEL 6.4.
 
The eth interface of VMs are interconnected via ‘intnet’ NIC settings.
The VMs are using 127/8 IP addresses to communicate with each other.
 
We are currently using VirtualBoX 3.1.8 and everything works fine.
But when we upgrade to latest VirtualBoX 5.0.10, we observe that the 127/8 IP addresses are being blocked and it does not reach the VM interfaces.
 
Based on our testing, it looks like this behaviour is seen from VirtualBox 3.2.0 onwards.
Can you please suggest if there is a way to get these IP address to be allowed?
 
Best Regards
George
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