Lab 6: Using the network

Due Tuesday, October 1, at 10:30 AM

1. Use wget to download this lab assignment. You can address the machine using either localhost, the IP address, or isoptera.lcsc.edu.
2. Use netcat (nc) to open a port and listen for incoming connections.
3. Use nmap to show that you have successfully opened a port (answering #2). It will be easiest to open a second terminal for this purpose, although you could use screen or background the listening process.
4. Use netcat and cat to pipe a file into the port you have opened, so that it appears in the terminal you have netcat listening in. Note that using nmap as in problem 3 will stop netcat from listening, and you will have to start it again for this question.
5. Use traceroute to determine the route from your computer or tux to a server located on another continent. Be careful, major websites tend to have servers in North America in addition to other places, and will redirect your query a nearer server. Check http://www.whois.sc/ for reverse DNS lookup (type an IP address into the box, and you will see a listing of information about the ownership of that IP. As a reminder, the answer to this question is a command using traceroute.
6. Optimization flags can be given to the C and C++ compilers. Use the time command to time 4 things: Time taken to compile quicksort.cpp with and without -O3, and also how long the complete demo takes to run with and without -O3. Should be well under a second to compile in either scenario. Running the demo will take longer than compiling it.