Unfortunately there is a problem when you try to add .Net Framework 3.51 to Windows Server 2012 using Server Manager!

In order to fix that issue and get .Net Framework 3.51 installed issue following command from Command Prompt:

dism /online /enable-feature /all /featurename:NetFX3 /source:x:\sources\sxs

 

In order to assign static IPv4 address to Windows Server 2012 Core using power shell use:

New-NetIPAddress -IPAddress 192.168.1.10 -InterfaceAlias “Ethernet” -DefaultGateway 192.168.1.1 -AddressFamily IPv4 -PrefixLength