In the good ol' days, one could merely have an ifconfig eth0:{1,2,3} etc. to alias as many addresses as one desired. Then we switched to iproute2 and that broke. According to "man ip" we need a way to add a LABEL=something to the ifconfig files so we can call ip with a label argument. At least that seems the only way to do it. At the very least, the ifconfig.eth0:1 idea won't work because ifup uses ip link show to verify the existence of an interface, and eth0:1 will never be listed as it isn't a real interface.
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