Talk of IPv6 space hoarding and fragmentation. Ughh. Perhaps we can avoid repeating IPv4 mistakes with IPv6. Exponential problems need linear solutions. The method for handing out blocks is flawed. There's no need for linear stride-N allocations, assuming that a highly-sparse array is acceptable. Allocate thus: 1. At start of 0b/1 2. At start of 1b/1 3. At start of 01b/2 4. At start of 11b/2 5. At start of 001b/3 6. At start of 101b/3 7. At start of 011b/3 8. At start of 111b/3 (and so forth) Allocate on /1 boundaries as many times as possible... then /2... followed by /3... next /4... et cetera. Let each allocation be long enough to contain sufficient address space; the space to the right is reserved for growth. Different networks will grow at different speeds. That is handled by allocating from "largest available /N" instead of "next /N in sequence", and tends to keep new allocations away from rapidly-growing ones. Fragmentation is drastically reduced. Allocating more space is a simple matter of "grow right", reducing the "hoard as much as possible because new space is a pain" mentality. Wait... we've had this discussion before: http://www.merit.edu/mail.archives/nanog/2006-03/msg00183.html Eddy -- Everquick Internet - http://www.everquick.net/ A division of Brotsman & Dreger, Inc. - http://www.brotsman.com/ Bandwidth, consulting, e-commerce, hosting, and network building Phone: +1 785 865 5885 Lawrence and [inter]national Phone: +1 316 794 8922 Wichita ________________________________________________________________________ DO NOT send mail to the following addresses: davidc@brics.com -*- jfconmaapaq@intc.net -*- sam@everquick.net Sending mail to spambait addresses is a great way to get blocked. Ditto for broken OOO autoresponders and foolish AV software backscatter.