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CSC 175: Data Communication and Networks, Spring 2020

Dr. Chuck C. Liang
Professor of Computer Science, Hofstra University .

Office Address:
201A Adams Hall
Hofstra University
Hempstead, NY 11550
Office Phone: (516 463) 5559

Email: cscccl@hofstra.edu (<- click to send me mail)

Office Hours: Check ZOOM OFFICE HOURS folder on blackboard page, email me for hours if you're not in this class with me

The Underground Web

Course Syllabus
Goals and Objectives

Online Resources:

• Ubuntu Server download
• Ubuntu Server Guide. Read at least the Networking section.
• Why are we not using a graphical interface? (REQUIRED READING). You may only install an X11 client
• Linux shell survival intro. (helpful but not enough)
• byobu quickstart includes other useful links.
• Nano text editor tutorial
• bit encoding (NRZ, NRZI, Manchester and 4B/5B), bit stuffing, parity bits, internet checksum
• CRC algorithm
• Internet "RFC" standardization documents.
• Ethernet frame format, 802.11 (wifi) Format and tutorial.
• TCP/IP suite of protocols
• IPv6 packet format
• Linux Directory Structure.
• iproute2 utility manual. Explains how to use the Linux commands ip route, ip addr, ip neigh etc ... ip route command by examples
• Linux Advanced Routing Howto (Read at least sections 4 and 5)
• Linux Routing Online Book
• Tshark by example, and tutorial. Also check tshark man page after apt install tshark.
• The Packet Filtering HOWTO. Read this document several times; carry it everywhere you go for a week. Eat and sleep with it. (printable version).
• iptables man page with new extentions. This describes more options than the original howto: you must learn how to use the connlimit feature.
• TCP finite state machine
• Network Address Translation HOWTO. This is just as important as the packet filtering howto. text-only version
• Longer, more advanced iptables tutorial. (Read at least chapters 6 and 7)
• Kaminsky's DNS bug (also here). You also need to read this if you want to understand how it really works. Solution to the bug using iptables.
• DNSSEC and how it works
• Needham-Schroeder Protocol and Feistel Cipher (theory for 2nd programming assignment).

INITIAL REQUIRED ASSIGNMENT
Linux Installation Instructions. (RELOAD FOR UPDATES)
Post-installation assignment (https installation).
Thincrust secure webserver (underground web)
Lab and HW assignment 1
C program checking if an ip address belonged to a network (improved)
Routing Workshop and assignment. Includes homework from Chap. 3
Packet filtering lab and assignment, now with sample solutions>
Chapter 5 homework
TCP Client Programming Assignment, with SAPMP server code in java and in c (and rust)
Second Programming Assignment: TTPAP, with support programs for Feistel Cipher and utility functions, and extra keys poulet.key, dinde.key, jambon.key
(crypt routines in C and Rust, and authentication server in Rust )

UDP socket assignment (includes server code in Java, C version here)

Optional Firewall Piercing Negotiator assignment.
Test with client code in java.

Sample Socket Programs and Related Notes:

• Basic file IO programs in C and Java
• Skeleton tcp client and server in C
• Skeleton tcp client and server in Java
• Simple web server and client in C, and Java (server, client)
• UDP torture client and server in C
  
• A few other important hints about socket programming.
• Collection of java utility functions (Netutils.java)
• UDP Socket program in Java
• Older guide on concurrent programming in C
• Simple example of threads in java.
• Generic Asynch Operations with Callbacks (java)
• Producer-Consumer simulation with pthreads (c)
• Semaphores in pthreads and in java
• WWWWW proxy server (java)

Announcements:

Final Exam Monday 5/11, 4-6pm on Zoom. Use the exam study guide with practice problems and sample solutions.
Sample solutions to Chapter 5 homework and some iptables -t nat questions.

Midterm Exam Monday 3/30. Use the exam study guide, which contains sample problems and solutions (and may be updated). Sample solutions to Ch. 2,3 homeworks are now available.

Read the textbook:
chapter 1: sections 1.1-1.3
chapter 2: sections 2.1-2.4, 2.6, 2.7.1 Pay special attention to 2.6
chapter 3: sections 3.2-3.3
chapter 4: section 4.1
chapter 5: sections 5.1, 5.2, 5.4. Pay special attention to 5.2, which is the most important section in the book.
chapter 6: sections 6.1, 6.3
chapter 8: sections 8.1-8.3, especially 8.3
chapter 9: section 9.3, especially 9.3.1