The fix is to flush the addresses on the interface and make sure is not more that one gateway listed in /etc/network/interfaces. My research has thrown up a lot of similar posts but they all generally reference a problem with physical interfaces not being able to use the ifup command. Where could it be referencing the interface name to be preventing it from being reused as a virtual ethernet type? It does allow me to recreate a dummy type interface with the first command again. After a reboot I then tried to create a virtual ethernet type interface with: sudo ip link add veth0 type vethīut when I do this I get the "file exists" error. Once finished I removed it with: sudo ip link delete veth0 type dummy I used this command to create a dummy ethernet interface called veth0: sudo ip link add veth0 type dummy
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June 2023
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