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  • (Aside: although I want to use this for technical/programming reasons, I felt that Super User was the best place to ask about the setup of a network, since it is not a programming activity, and would not be on-topic at Stack Overflow).
    – halfer
    Commented Jun 15, 2020 at 16:44
  • If you need Internet access from the VM then you need a bridged adapter. That adapter will not be reachable without port forwarding from your host. For VM-2-VM connections you should set up a NATted network with DHCP server in VirtualBox and add a second adapter on your VMs connected to that network. Depending on your OS you might need to configure it additionally - see here. That should give you a good start....
    – Zina
    Commented Jun 15, 2020 at 17:24
  • Thanks @Zina. Yes, I would want internet access for each VM - the default network (NAT) adapter for each one seems to provide that already. I don't mind if VM-2-VM is achieved through the same adapter, though my approach thus far has been to add a second one. Thank you for the steer to try adding a second NAT device plus a VB DHCP server - I will give that a go.
    – halfer
    Commented Jun 15, 2020 at 18:30
  • regarding your update, tick "Configure Adapter Manually", give the Network for example a /24 subnet e.g. 192.168.56.1/24, and the DHCP you could set: Server IP 192.168.56.100/24, and lower IP 192.168.56.101 Upper IP 192.168.56.254 and with /24 I mean 255.255.255.0
    – Zina
    Commented Jun 15, 2020 at 19:27
  • Thanks @Zina, I will try that too!
    – halfer
    Commented Jun 15, 2020 at 19:40