nanog mailing list archives
Re: classful routes redux
From: Geoff Huston <gih () apnic net>
Date: Thu, 03 Nov 2005 15:54:22 +1100
At 01:16 PM 3/11/2005, Christopher L. Morrow wrote:
On Wed, 2 Nov 2005, Fred Baker wrote: > > actually, no, I could compare a /48 to a class A. > (someone might already have asked this, but...) why /48?
Because the thinking at the time appears to be that to "ease' renumbering reduce the costs associated with address distribution functions (and associated network assessment tasks) and because there were heaps of addresses, all end-sites would get the same address allocation, and the uniform amount that was arrived at was a /48 . When asked whether this referred to _everything_ that may require subnets, the answer was "yes". When asked whether this encompassed everything from a mobile phone to a large corporate the answer given was, once more, "yes".
Why /48 rather than /47 or /49? - alignment to nibble boundaries to make DNS delegation easier.
Why /48 rather than /32 or /40? I really cannot say - I suspect that /48 is the largest end site number that meets the projected scope as described in RFC 3177.
regards, Geoff
Current thread:
- Re: classful routes redux, (continued)
- Re: classful routes redux Geoff Huston (Nov 04)
- Message not available
- Re: classful routes redux Geoff Huston (Nov 05)
- Re: classful routes redux Marshall Eubanks (Nov 05)
- Re: classful routes redux Paul Vixie (Nov 03)
- Re: classful routes redux Christopher L. Morrow (Nov 02)
- Re: classful routes redux bmanning (Nov 02)
- Message not available
- Re: classful routes redux Christopher L. Morrow (Nov 02)
- Re: classful routes redux Randy Bush (Nov 02)
- Re: classful routes redux Christopher L. Morrow (Nov 02)
- Re: classful routes redux bmanning (Nov 02)
- Message not available
- Re: classful routes redux Geoff Huston (Nov 02)
- Re: classful routes redux Robert E . Seastrom (Nov 03)
- Re: classful routes redux Paul Jakma (Nov 02)
- Re: Using BGP to force inbound and outbound routing through particular routes Christopher L. Morrow (Nov 02)