Darren says it best - so here's my summary:
Because you're using 2.5.1 or earlier and
10.224.128 isn't a "network"
10.0.0.0 is a "network"
Class A networks have 1 octet specified and the first bit is "0".
Class B networks have 2 octets specified and the first bits are "10".
Class C networks have 3 octets specified and the first bits are "110".
Since 10.224.128.0 starts with a "0" in binary, it's a class A network
to 2.5.1 or earlier. The *entire* network can be assigned a subnet
mask, but no smaller portion of it can have a different one.
Solaris 2.6 and greater have CIDR rules in the routing code and all
those limitations are removed.
thanks to:
Darren Dunham
Charles Gagnon
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