nanog mailing list archives
Re: classful routes redux
From: "Stephen Sprunk" <stephen () sprunk org>
Date: Mon, 7 Nov 2005 13:38:22 -0600
Thus spake <Michael.Dillon () btradianz com>
One way to visualize this is to imagine the Internet as a cloud. At the core of the cloud are the core providers and at the edge of the cloud are the end user organizations, many of which appear to be singly homed. However, hidden behind this edge is a thin layer which represents a private internet. It also connects many networks but it does *NOT* exchange traffic with the public Internet. All the networks connected to these private internets are also connected to the public Internet but they implement strict traffic separation policies internally. In some cases, this is an air gap but these days it is often a bunch of firewalls.
And let's not forget that various parts of that "thin layer" connect to each other in something approaching a partial mesh with no transitive reachability.
While I doubt that it's anywhere near enough to account for all the "MIA" ASNs, nor do we have any way of knowing for sure, but many of those folks cannot get by with private ASNs for those networks for the same reason they can't use RFC1918 space. Others give in and use static routes and double-NATs.
S Stephen Sprunk "Stupid people surround themselves with smart CCIE #3723 people. Smart people surround themselves withK5SSS smart people who disagree with them." --Aaron Sorkin
Current thread:
- Re: classful routes redux, (continued)
- Re: classful routes redux Richard A Steenbergen (Nov 03)
- Re: classful routes redux Stephen J. Wilcox (Nov 03)
- Re: classful routes redux bmanning (Nov 03)
- Re: classful routes redux Patrick W. Gilmore (Nov 03)
- Re: classful routes redux Russ White (Nov 04)
- Re: classful routes redux Joe Abley (Nov 04)
- Re: classful routes redux Russ White (Nov 04)
- Re: classful routes redux Joseph S D Yao (Nov 04)
- Re: classful routes redux Michael . Dillon (Nov 07)
- Re: classful routes redux Joe Abley (Nov 07)
- Re: classful routes redux Stephen Sprunk (Nov 07)
- Message not available
- Re: classful routes redux Henk Uijterwaal (Nov 07)
- Re: classful routes redux Joseph S D Yao (Nov 07)
- Re: classful routes redux Michael . Dillon (Nov 08)
- Re: classful routes redux Per Heldal (Nov 08)
- Re: classful routes redux Michael . Dillon (Nov 08)
- Re: classful routes redux Per Heldal (Nov 08)
- Re: classful routes redux Michael . Dillon (Nov 08)
- Re: classful routes redux Stephen Sprunk (Nov 08)
- Re: classful routes redux Joseph S D Yao (Nov 09)
- Message not available
- IPv6 in a current defaultless SFP ISP John Dupuy (Nov 08)