Virtualbox LAN access settings

The bridged adapter-bridge mode can be understood as follows. It sets up a bridge through the host Nic and connects directly to the network. Therefore, it allows virtual machines to be allocated to independent IP addresses in a network. All network functions are the same as those of real machines in the network.

Relationship between virtual machines and hosts:
Mutual access is allowed because the virtual machine has an independent IP address in the real network segment. The host and the virtual machine are in the same network segment and can access each other through their respective IP addresses.

Other VM relationships in the network:
Mutual access is allowed. Because the virtual machine has an independent IP address in the real network segment, the virtual machine and other hosts on the network are in the same network segment and can access each other through their respective IP addresses.

Relationship between virtual machines and virtual machines:
They can access each other for the same reason.

The default settings are as follows:

After this modification, the network cannot be connected. After trying multiple settings, the following settings perfectly implement LAN access.