17. Authors address

   Harald Tveit Alvestrand
   UNINETT
   P.O.Box 6883 Elgeseter
   N-7002 TRONDHEIM
    NORWAY

   +47 73 59 70 94
   Harald.T.Alvestrand@uninett.no

   Peter Jurg
   SURFnet
   P.O.Box 19035
   NL-3501 DA UTRECHT
   THE NETHERLANDS

   +31 30 2305305
   Peter.Jurg@surfnet.nl