Aliases
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Quoted 6 lines · Ralf Baechle
For various reasons interfaces aliases are deprecated. The recommended way of doing things these days is just adding more addresses to an interface with the ip(8) program from the iproute package. It works like:
ip addr add 192.168.2.0/24 broadcast 192.168.2.255 scope host dev eth0
Newer ifconfig also supports "add" for IPv4 (older supported it only for v6)
The problem of the original poster is also likely to have an too old ifconfig; older ones had some O(n^2) algorithms with hurt with many interfaces.
-Andi