I have this set up now in "appliance mode", considering people may want
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to try it out without running a dhcp server and possibly breaking their
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network(s). Single NIC, bridged. (Apparently running this DHCP server should not cause issues with others as schoolserver's dhcp server is set to be 'not authoritative' but I will leave it this way for now)
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If you wanted to change the mode, I believe you only have to go into the
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machine settings in VirtualBox, add a NIC, boot up the VM and rerun