Hi Gert,
PI ("provider independent") address space - this could theoretically be used. You do not have to ask the old ISP or RIPE for permission. You just register the routes in the RIPE database, ask the old ISP to stop announcing them, and start announcing them via BGP. PI space has other disadvantages, though, like "much harder to debug if some goal in the Internet cannot be reached", so we usually recommend to the customer to return his PI space to RIPE and accept PI space from us ^^ I guess this should be "PA" here !? ______________/
(unless the PI block is very large and the customer network so complex that it would make renumbering too hard).
Cheers, Wilfried. _________________________________:_____________________________________ Wilfried Woeber : e-mail: Woeber@CC.UniVie.ac.at UniVie Computer Center - ACOnet : Tel: +43 1 4277 - 140 33 Universitaetsstrasse 7 : Fax: +43 1 4277 - 9 140 A-1010 Vienna, Austria, Europe : RIPE-DB: WW144, PGP keyID 0xF0ACB369 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~:~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ A catholic church ad sign near Maryborough, QLD:"Where Miracles Happen"