There are no such interfaces, so that it is non-sense to show
them in /proc/net/dev. They are emulated MINIMALLY just not to break
the things which people used to. But each emulation has some natural
boundaries.
Documentation update is excellent, only I did not understood this:
: +o For IP aliasing you must have IP_ALIAS support included by static
: + linking; it is avail as a module.
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Alexey Kuznetsov