Sending data without using the Switch

First of all, hello everyone.

I am new to using Proxmox, and I have a question that maybe you can solve easily, but I have no idea about it. I have already implemented Proxmox with multiple virtual machines, and everything works smoothly.

I have a virtual machine (VM1) that offers web services, but the databases of these services are in the second VM (VM2). What I do, is that two virtual machines are capable of transmitting data over the network, without reaching the switch, that is, that the data sent directly VM1 to VM2.

That is, a client connects to the VM1 by subnet 192.168.xx, and this makes the query to the database to VM2, but using another network, it would for example 10.10.XX

I have understood that this can be done through a Bridge, but I have no idea how to do it in Proxmox. Anybody can help me or give me an idea of what I have to do?

I do not write very good English, so I have relied on Google Translate. Sorry for any inconvenience this may cause.

Thanks