The Chair introduced the SIG and explained the agenda. He explained that the presentation due to be given by Phillip Harris was cancelled as Phillip had to return home.
Geoff Huston, Telstra
The speaker noted that in 1998, the routing table began a trend of exponential growth at a rate greater than Moore's Law. Following the end of the Internet boom in 2000/2001, this pattern changed. The speaker also began tracking 40 separate BGP feeds at that time.
The speaker explained that while approximately 1.8 billion IP addresses have been allocated to date, 0.5 billion of those allocated addresses are not currently being advertised.
In 2002, there was a significant drop in the growth rate of announcements. The speaker was not sure of the reasons for this decline.
The speaker noted that there is a lot of noise in the BGP table; within the blocks covered by large announcements, there are smaller fragmented announcements made from within this space. The fragmented routes appear to be announced to for reasons of local resiliency and local traffic engineering. The speaker commented that half of the global table seemed to be expressions of local policy.
The speaker reported that the growth of the number of unique Autonomous Systems over the past few years is slowing.
The speaker explained that his research was showing that the growth of the Internet is no longer exponential, but is growing in a gentle linear fashion.
The speaker highlighted the information available in the CIDR Report and suggested that participants access the website for more details.
Allocation vs announcement
Geoff Huston, Telstra
The speaker explained that the motivation behind his research into the relationship between allocations and announcements was that although many ISPs perform prefix length filtering, due to accidents, there have been significant leaks.
The presenter explained that his research using RIR and BGP data showed that a quarter of the allocations made by RIRs in the past year are not being announced. Of the 3641 past year's allocations advertised, 2938 advertisements matched the allocation sizes exactly. The remaining 1206 allocations have created over 7000 announcements. The presenter explained that it appeared that the networks using these remaining 1206 allocations are cutting up their allocations into /24s using old classful methods of addressing.
The presented noted that it appears that a fifth of the networks on the Internet are continuing to use old classful methods to manage their address blocks.
The speaker commented that historical data showed that when CIDR began to be deployed, networks began to use better announcing techniques.
Questions and discussion