On Wed, 26 Mar 2003, Tony Hain wrote: > Pekka Savola wrote: > > People didn't see the need for RFC1918 space in IPv6. > > Just like they didn't see the need for private address space in IPv4 > until there were massive deployments of whatever random numbers people > found in documents. For those who have forgotten, private address space > was not set aside to support NAT, it exists to provide space for > disconnected networks, that won't collide with existing allocations when > those attach. NAT came along later and took advantage of the existence > of private space. > > There is a need for address space for disconnected networks. If the > argument is to set aside a different set of address space and define it > as unroutable, what is the point? We already have a defined unroutable > space, what value does a different one add? Any issues that are raised > for FEC0:: will hold for whatever new space gets defined.
The counter-argument to this stems from the fact that: 1) completely disconnected networks are relatively rare, and 2) whichever address space you use, you have to renumber *completely* anyway, so it doesn't matter that much which one it is. (On the other hand, if you can avoid renumbering by NAT, it is very important you don't clash with any existing global address space.) For my disconnected networks (small ones, admittably), I've certainly never bothered with FEC0::/10. That was the observation from some other operators as well. As for hijacking -- that's a problem when you become non-disconnected. A bug wherever you're connected to. (FWIW, I'm ok with a semi-standard address space, which is treated as globals. For example, the documentation prefix will probably be used to some extent.) -- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
