Hi, On Fri, Oct 17, 2003 at 10:56:51AM +0200, Thomas.Levy@alcatel.fr wrote:
1) Usage of PI addresses is not recommended by RIPE. I don't want to raise a debate on this point. However, I would be interested in knowing the reasons for this. Is it for routing purpose?
One of the major disadvantages of PI space to achieve global internet connectivity is "impact on global routing". Especially for networks needing only fairly few addresses, using addresses from their ISP's PA network blocks means that their route can be aggregated into the ISP's PA route, so the individual network doesn't have an impact on all routers world-wide that carry the full IPv4 routing table. A PI network will always be visible as an individual route, with no way to aggregate it. Of course PI has advantages (it's much more convenient for the enterprise in question) and in some cases there is no way around PI (enterprise-local networks that are not connected to any ISP but need unique address space for VPN partner connections etc.). Gert Doering -- NetMaster -- Total number of prefixes smaller than registry allocations: 57785 (56883) SpaceNet AG Mail: netmaster@Space.Net Joseph-Dollinger-Bogen 14 Tel : +49-89-32356-0 80807 Muenchen Fax : +49-89-32356-299