As of January 2006 I am now at Neustar Ultra Services, formerly UltraDNS, a managed DNS-based service provider. I remain affiliated with DePaul as both a part-time faculty member and as a collaborator with colleagues within the School of Computer Science, Telecommunications and Information Systems. I am also affiliated with Northwestern Univerity as a visiting fellow after having left my role there as Network Engineer. See below for my ongoing research efforts that are being done with the support of my ongoing affiliation with DePaul as well as my continuing teaching assignments.

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 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

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

Last updated: February, 2008