You have successfully added the virtual interfaces, you are having trouble adding the network to the routing table.
http://handsonhowto.com/virt.html
Possibly missing out some of these steps caused some confusion.
route command error messages[pdf]
Quote:
Error : SIOCADDRT invalid argument
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SIOCADDRT is an error message ADDing a RouTe.
"invalid argument" normally comes from missing something out. The line:
Quote:
route add -net 192.168.0.0 netmask 255.255.255.0
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looks fine though. Is there anything else to the error message?