How to communicate two vms

[youssef]

Hello,

On a mac (host) I have two virtual machine on virtualbox, for a POC, and I need to communicate by networks the two VMs.

The first VM is under windows
The second VM is under Linux CentOS

(Exemple: one vm for the database, and another for the application)

Please, how can I do for the network configurations in order to communicate the two VMs to each other?

thank you

[socratis]

Here are the networking modes available in VirtualBox. Look at the VM1<->VM2 column to be a "Yes".
[pre]+-----------+-------------+-------------+----------------+----------------+
| | VM <-> Host | VM1 <-> VM2 | VM -> Internet | VM <- Internet |
+-----------+-------------+-------------+----------------+----------------+
| HostOnly | Yes | Yes | No | No |
| Internal | No | Yes | No | No |
| Bridged | Yes | Yes | Yes | Yes |
| NAT | No | No | Yes | Port forward |
| NATNet | No | Yes | Yes | Port forward |
+-----------+-------------+-------------+----------------+----------------+[/pre]
More information, ch. 6. Virtual networking. And remember, you can always have more than one network card.

[youssef]

Hello,

Thank you for your answer, it helped me,
I used the bridge mode, it works, but I noticed:
The VMs retrieves an ip address of the return on which the machine host and connected. As I work a lot in a train, (no wifi) or I change several times in the day the networks wifi, the VMs constantly changes IP address.

Is there a method or technique for the VMs to keep the same IP address all the time ?

thank you

[BillG]

Yes there is. Use a different network for your vm to vm communication. As socratis sais above, you can have more than one NIC in a vm. Use one card set to NAT to give the vms Internet access and a second to communicate with each other.

I would enable a second NIC in each vm, set them to internal and configure these NICs to be in their own IP subnet. Access the database using its internal IP.