Set default Windows Server interface IP with multiple IPs
Solution 1:
have you seen this link? http://securahosting.com/technical-insight/windows-server/set-primary-ip-address-windows-server-2012#.VOe_0EfF98E
and this: http://www.confusedamused.com/notebook/source-ip-address-preference-with-multiple-ips-on-a-nic/
shortly, in netsh address setup use SkipAsSource=true flag for all non-primary IPs
Solution 2:
You can easily use PowerShell to do this:
Set-NetIPAddress -IPAddress 192.168.1.221 -SkipAsSource:$true
Do that for all IP addresses on interface that you don't want to be default. Leave one IP where SkipAsSource = False. That IP will end up being the default.