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IP stacks may treat a network interface as "down" when it states a MAC address with the I/G bit (bit 40) set to "Group" (value 0) instead of "Individual" (value 1). This was observed with a TinyCore 8 inside a Virtualbox VM. Thus, the previously choosen 03:03:03:03:03:00 as base for the MAC address allocator is bad. Now we use the 02:02:02:02:02:00 instead. This also ensures that the MAC addresses are not marked as "Universal" but as "Local" (bit 41, value 1) which is correct in general as the router allocates MAC addresses only for virtual networks. Ref #2490
This source-code repository contains genuine low-level OS components and interfaces of Genode. It solely depends on the framework's base API.