sql server with multiple instance

hi  All,

i want  to  install sql server with two instance   and i want  to assign two  separate is  ips   for  both   default instance  and named  instance   and  both   should  work like two different server

note:  If i  logged  with  one  ip(default instance)   it should  show  its  own  databases  not both or  named   instance  databases

thanks 

 chintala