With 6.1.30 on macOS 12.0.1 Monterey, I run a Linux VM. The VM has two virtual network interfaces, one NAT and one Host-only, connecting to vboxnet0.
vboxnet0 has been set up with File / Host Network Manager, Configure Adapter Manually with IP 192.168.56.1, netmask 255.255.255.0 and DHCP server on, with server address 192.168.56.2, and lower bound of 192.168.56.3.
Now, on the VM I get two network interfaces, with IP addresses from 10.0.2.15 (from NAT) and 192.168.56.3 (from Host-only). In the VM I can ping 192.168.56.2, but that's all I can. (curl and ssh to the same IP say "port 80: Protocol not available").
On the Host, I see, with ifconfig:
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vboxnet0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
ether 0a:00:27:00:00:00
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traceroute: Can't find interface vboxnet0