Anything that we can control, like tap-%domid.%devid would be good though. It doesn't have to follow any specific nomenclature, but it will be good to be able to specify two integers, one that corresponds to the domain id, and another one that identifies the specific network card inside that domain. So there's no need to change the /dev/tapN, or the device number, but just the name of the interface. As far as I know that's just a string in the struct ifnet, and it's compared when one searches by name, so it should be changeable. I had thought setting the interface name would change more and be more intrusive, but maybe it's not so bad. (It does make sense to require it to start with 'tap' to avoid collisions.) It seems easy enough to add the ioctl and see if things blow up...
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