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Monthly Archives: November 2009

IRW:2009-11: Subnetting and Security

25 Wednesday Nov 2009

Posted by egarcia in Internet Engineering, Newsletters

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The current issue of IRW arrived last week to subscribers. Look what non-subscribers missed:.

Featuring article: Subnetting and Security

“The purpose of subnetting is to break large networks into smaller networks called subnets by borrowing bits from the network portion of an IP address. This is done by using a variable length subnet mask. As the IP addresses of host computers on each subnet are masked by the network address these are invisible to those outside the network. In this sense, subnetting benefits security. Conversely, the cost of misconfigured subnets creates Internet vulnerabilities. For those working at the intersection of Information Security, IP address masking and subnetting might be relevant when it comes to analyzing spoofing, penetration hacking, and subnet advertisements. Accordingly, in this issue of the newsletter we present a straightforward approach on the art of subnetting.”

Enjoy it.

Remembering Mike Muuss

20 Friday Nov 2009

Posted by egarcia in Newsletters

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Mike Muuss

Nine years ago the great Mike Muuss, inventor of PING and many other ground  breaking software tools, was killed in a car accident. Almost a decade later we pay respect to his memory in the current issue of IR Watch (to be delivered a bit late in few days). The Who is Who column of IRW features the following:

Michael John Muuss (October 16, 1958 – November 20, 2000), a multi-talented computer wizard who helped lay the foundations for the modern-day Internet, was killed at the age of 42 in an automobile accident near his home in Havre de Grace, while returning home from a restaurant, when his car was involved in a multivehicle pileup on Interstate 95. At 9 years from his death, we pay respects to his memory. The following are excerpts from his Obiturary. (Obituary from The Baltimore Sun Company: http://www.ping127001.com/pingpage/muuss.htm).

A graduate of the Johns Hopkins University, Muuss spent his entire career at the U.S. Army Research Laboratory (ARL) at Aberdeen Proving Ground, where he established a reputation as an enthusiastic problem-solver who did groundbreaking work in areas ranging from computer networks to graphics.

He is best known for inventing PING, one of the most widely used IP address retrieval and diagnostic tools for computer networks in the world and used in almost all PCs.

Contrary to popular opinion/urban legends, the PING name was not intended to be a ping pong analogy or to stand for Packet Internet Grouper. According to his own words (http://ftp.arl.mil/~mike/ping.html):

  • “I named it after the sound that a sonar makes, inspired by the whole principle of echo-location.”
  • “From my point of view PING is not an acronym standing for Packet InterNet Grouper, it’s a sonar analogy.“

In the early 1980s, Muuss helped lay the technological foundation that would transform what was then called the ARPANET, back then an obscure military computer network created in 1969 by the Department of Defense, into the modern-day Internet. (http://ftp.arl.mil/~mike/).  

Muuss also created BRL-CAD, a program that allowed the military to create sophisticated 3-D models. Over the years, BRL-CAD has become one of the Army’s most-licensed technologies and is used to model everything from tanks to brain tumors.

His work in computer security landed him a cameo appearance in Clifford Stoll’s 1989 hacker classic “The Cuckoo’s Egg,” a nonfiction thriller about the hunt for an international band of computer criminals. Muuss was also known for tracking down crackers.

In 1990, he was one of the government’s key witnesses in the case against Robert Tappan Morris, whose “Morris Worm” in 1988 nearly brought down the Internet.
(Case Sentence: http://www.nytimes.com/1990/05/05/us/computer-intruder-is-put-on-probation-and-fined-10000.html?scp=2&sq=robert+tappan+morris&st=nyt
Case Appeal: http://morrisworm.larrymcelhiney.com/morris_appeal.txt).

In 1999 and at the age of 41, Muuss was given the Research and Development Achievement Award, the Army’s highest civilian award for scientific accomplishments. Before his death, he assembled an impressive review on the History of Computing Information (http://ftp.arl.army.mil/~mike/comphist/).

IP Packet Fragmentation, MTU, and MSS Tutorials

16 Monday Nov 2009

Posted by egarcia in Internet Engineering

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Two new tutorials on Internet Engineering are available now from Mi Islita.com:

IP Packet Fragmentation Tutorial [pdf]

MTU and MSS Tutorial [pdf]

Both are based on lecture material provided in class during the IE Part 1 course. These can be used as reference material for other courses such as Network Security, Internet Engineering, Internet Architecture, etc.

The first one is an introduction to packet fragmentation analysis while the second one delves into experimental techniques on maximum transmission unit and maximum segment size calculations.

The tutorials can be used to understand Ping of Death, Fragmentation Offset Attacks, Tiny Fragmentation Attacks, Firewall Fragmentation Attacks and other forms of hacks.

Enjoy it.

Global Terrorism Database

03 Tuesday Nov 2009

Posted by egarcia in Data Mining, Homeland Security

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If you are into homeland security oriented data mining, this post is for you.

The University of Maryland has a Global Terrorism Database (GTD; http://www.start.umd.edu/gtd/) with information on over 80,000 terrorist attacks that intelligence researchers can tap into.

GTD is an open-source database including information on terrorist events around the world from 1970 through 2007 (with annual updates planned for the future). Unlike many other event databases, the GTD includes systematic data on domestic as well as international terrorist incidents that have occurred during this time period and now includes more than 80,000 cases.

You can search by keywords or browse by region, country, perpetraror, weapon, attack, or target.

It also has advanced search capabilites. To perform an advanced search you need to select all categories you wish to search. If you do not check any options then your search will include all content from that category, for example, selecting Algeria from the “Country” list will restrict your search to incidents in Algeria, while leaving it blank searches all countries.

Incident searches can be restricted to specific years using several pull-down menus.

I tested by querying [puerto rico] and indeed was able to obtain incident records related with Los Macheteros. The answer set, however, included results not relevant to the Island of Puerto Rico.

The database is pretty small, but can come handy at times. Definitively, I will use it for one of my next graduate courses on search engine architectures.

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