hil, All of this because of the Colt tests :)) - back to books and: Problem with OSPF according to "Routing TCP/IP" pg 417 point-to-multipoint network ospf packets are multicast pg 433 On NBMA, point-to-multipoint and virtual links network types, Hellos are unicast to individual neighbors. Is Hello packet from page 433 an OSPF packet from page 417? or Is the packet on page 417 the LSU, LSR and LSA packet type? Thank you. Mihai **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _________________________________ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]