jtk

John Kristoff

DePaul University
1 E. Jackson Blvd.
Chicago, IL 60604 USA

email: jtk@depaul.edu
PGP public key: jtk-key.txt

Research

DNS - Open Recursive Name Server Probing
Open Recursive Name Servers have been associated with a number recent attacks that take advantage of source address spoofing and the domain name system's capability to provide amplified answers to small questions. This project tries to identify and characterize open recursive name servers through the use of a number of different remote probing techniques.

traceiface
traceroute with an extension to discover the router egress hop in the path

Under consideration or in planning:
DNS - NS RRset Caching Behaviors
DNS - higher ed DNS configuration, stability and security monitor
Routing/DNS - DNS Root/TLD prefix announcements
Routing/Security - higher ed distributed route monitor
Security - Deployment of Packet Filter/Mangling on the Internet
Security - Slammer, 4 Years After
Bridging - Spanning Tree Monitor

Teaching

TDC 563, Protocols and Techniques for Data Networks, Autumn 2014/2015
TDC 375, Network Protocols, Spring 2013/2014 (combined course with TDC 563)
TDC 563, Protocols and Techniques for Data Networks, Spring 2013/2014 (combined course with TDC 375)
TDC 375, Network Protocols, Winter 2013/2014
TDC 375, Network Protocols, Autumn 2012/2013
TDC-463, Computer Networks and Data Systems, Winter 2011/2012
TDC-375, Network Protocols, Spring 2010/2011
TDC 375, Network Protocols, Autumn 2010/2011
TDC 375, Network Protocols, Spring 2009/2010
TDC 375, Network Protocols, Autumn 2009/2010
TDC 363, Intro to Local Area Networks, Spring 2007/2008
IT 263, Applied Networks and Security, Winter 2006/2007
TDC 375, Network Protocols, Autumn 2003/2004
TDC 375, Network Protocols, Spring 2003
TDC 375, Network Protocols, Winter 2002
TDC 365, Network Interconnect. Tech., Spring 2001
Institute for Professional Development (IPD)
TDC 463, Computer Networks, Autumn 2000
TDC 463, Computer Networks, Spring 2000
TDC 463, Computer Networks, Autumn 1999

Code

int2ipaddr.pl - 32-bit integer to IPv4 address converter
ipaddr2int.pl - IPv4 address to 32-bit integer converter
ptrquery.pl - DNS batch PTR query util

Other

Slides from various presentations
Papers submitted or in progress
Technotes on various technical subjects
Real-world denial of service attack
Random Early Detection (RED) experiment data point
xDSL frequently asked questions (FAQ)
Debian GNU/Linux on an IBM ThinkPad 600e
Browser bookmarks.html
Mozilla blocked image sites (ads): cookperm.txt
The 10 Networking Commandments
Numbering systems and code sets

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