Archive for the 'Topology' Category

Exhausted IPv4 address architectures

Tuesday, May 3rd, 2011 by kc

In light of available data on global IPv6 deployment, ISPs, and those who build equipment for them, have already accepted that multi-level network address translation (NAT, between IPv4 and IPv6 networks) is here for the foreseeable future, with all its limits on end-to-end reachability and application functionality, and its required unscalable per-protocol hacks. Whether “carrier-grade” NAT (CGN) technology supports a transition to IPv6 or becomes the endgame itself is irrelevant to the planning horizon of public companies, who must now develop sustainable business models that accommodate, if not support, IPv4 scarcity. I’ve heard a few notable predicted outcomes from engineers in the field.


CAIDA’s IPv6 measurement and analysis activities

Friday, April 29th, 2011 by kc

In pursuit of more rigorous data on IPv6 deployment, CAIDA has undertaken four IPv6 measurement and analysis exercises: address allocation data; traceroute-based topology; DNS queries from root servers; and a global survey of network operators in 2008.


annotated bibliography of IP geolocation papers

Saturday, April 23rd, 2011 by kc

Many applications require the association of Internet numbering resources with an accurate geographic label at some granularity. For some applications, knowing the country of origin might be sufficient; for others a more precise indication at state, city or zip code granularity, or even a specific latitude/longitude is needed.

However, which method(s) work best? Which database sources and services are most reliable, at what geographic resolutions? If a data source provides the geographic location of the owner of an IP address, is this location the same as the location where the device is actually broadcasting and receiving packets? And, if different, can the difference be quantified?


Unsolicited Internet Traffic from Libya

Wednesday, March 23rd, 2011 by Emile Aben

Amidst the recent political unrest in the Middle East, researchers have observed significant changes in Internet traffic and connectivity. In this article we tap into a previously unused source of data: unsolicited Internet traffic arriving from Libya. The traffic data we captured shows distinct changes in unsolicited traffic patterns since 17 February 2011.

Most of the information already published about Internet connectivity in the Middle East has been based on four types of data:


Caidagram: visualizing geographically annotated Internet measurements

Monday, February 28th, 2011 by Claudio Squarcella

I post this article to describe the results of my five month visit to CAIDA and UC San Diego, and to thank the organizations that collaborated to make this work possible.


Growth trends in the AS-level Internet

Friday, May 7th, 2010 by Amogh Dhamdhere

We have studied growth trends in the number of ASes seen advertised in the global routing system from different regional registries (similar to Geoff Huston’s 32-bit AS Number Report, but with per-registry trends). We used Routeviews and RIPE BGP dumps over the last 12 years, and Team Cymru’s WHOIS lookup service to map ASNes to registries as of March 2010. To our knowledge, historical data to map an ASN to a regional registry at any given time in the past is not available, so we cannot account for ASN movement between registries. More information about the data collection and pre-processing is in our IMC 2008 paper, “Ten Years in the Evolution of the Internet Ecosystem” and our supplemental data page.


‘academic’ thoughts about a ‘future Internet’

Monday, October 12th, 2009 by kc

This post is our submitted response to NSF’s call for expressions of interest in the Future Internet Architectures summit, which i am attending this week.

What scientific contributions will you bring to the discussion about Future Internet architectures?

As scientists, we are compelled to explore how the peculiar structure relates to the function(s) of complex networks. Many complex networks in nature share the peculiar structural character of the Internet, but they also manifest phenomenal behavior: they efficiently route information without any observable routing protocol overhead. This achievement is currently beyond the reach of man-made networks. The Internet still uses a 30-year old routing architecture with fundamentally unscalable overhead requirements.  Yet in those 30 years, the Internet’s inter-domain topology has evolved toward a structure for which nature has superior routing technology, if only we can figure out how to use it!


IPv4 exhaustion research agenda, qty 1.

Sunday, March 29th, 2009 by kc

[drafted this entry a few months ago but have been reluctant to post because it’s incomplete. but after reading about the ARIN Board’s emergency proposal last week to create IPv4 address markets, variations of which have already been approved in European (RIPE) and Asia-Pacific (APNIC) IP address policy communities, i decided it’s complete enough. -k.]

A few policy questions on which the RIR-community should funnel address-registration tax dollars into peer-reviewed research:


top ten things lawyers should know about the Internet: #9

Friday, June 27th, 2008 by kc

[Jump to a Top Ten item: #1 #2 #3 #4 #5 #6 #7 #8 #9 #10]

#9: The news is not all bad: there is a reason everyone wants to be connected to all the world’s knowledge — as well as each other — besides its status as the most powerful complex system ever created by man. The Internet’s practical promise for individual freedom, democratic engagement, and economic empowerment, is also unparalleled. This promise is sufficient inspiration for an open, technically literate conversation about how to invest in technologies and policies to support articulated social objectives.


top ten things lawyers should know about the Internet: #8

Saturday, May 10th, 2008 by kc

[Jump to a Top Ten item: #1 #2 #3 #4 #5 #6 #7 #8 #9 #10]

#8: The opaqueness of the infrastructure to empirical analysis has generated many problematic responses from rigidly circumscribed communities earnestly trying to get their jobs done.