I have two network interfaces in my workstation and I wanted to dedicate one to a separate network to use with my real and simulated MicroVAXs. The first problem was how to bring the second interface up without giving it an IP address.
Then I needed to configure a virtual interface (as before) before bridging it to the second network interface without giving the bridge an IP address.
Since this requires you to modify ‘/etc/network/interfaces’ you need to be a super user…
Then you need to edit ‘/etc/network/interfaces’ and comment out the lines associated with the second network interface and add a new section to bring up the second interface without an address. (Leaving the original section intact makes it easy to undo any changes later if necessary).
If all you need is to do bring an interface up without assigning it an IP address then you don’t need to do any more. However, I wanted to be able to use this interface with SIMH or QEMU so I also needed to created a virtual device and bridge it to the physical interface.
You will need to reboot for these changes to take effect.
To use the new virtual network interface with a simulated MicroVAX you will need to use the following SIMH commands when starting the simulator.
I usually use the same MAC address as the one that is set when DecNET starts.