On 2/9/2011 9:15 PM, Ricky Beam wrote:
On Wed, 09 Feb 2011 16:42:14 -0500, Nathan Eisenberg <nathan@atlasnetworks.us> wrote:
What do you mean, lit up? You mean they're not in the routing tables that you get from your carriers? I'd argue that's no indication of whether they're in use or not.
That's pretty much the definition of "in use". If they don't appear in the global routing table, then they aren't being used.
There is no one universal "global routing table". They probably appear in someone's routing table, somewhere... just not yours. If Cogent stops peering with you (I picked them, because that's not out of the question) and you stop seeing all their downstream routes, did those addresses suddenly become available for reassignment?
I cannot send traffic to them; they cannot send traffic to me.
That's true of almost all addresses these days, what with firewalls and all.
In my recent probe of route servers, I found 22 legacy /8's that were partly or completely unused. I'm a little surprised ARIN/ICANN thinks it's a waste of time to even try to reclaim them.
How many days do you think a single /8 lasts at current assignment rates? How would ARIN/ICANN go about reclaiming addresses that someone believes they are using but that you don't think are in use? Matthew Kaufman