In this lab we try out a bunch of stuff. You will need to follow alone with the instructor.
Where are you?
Here are some commands that tell you a little about your computer.
[…]$ hostname […]$ hostname -f […]$ ip addr […]$ ip addr | grep inet […]$ ip addr | grep link […]$ ip route […]$ netstat -a | more
A simple server and client
Let’s make a connection. You’ll need two computers with two windows on each computer. One computer is the server and the other is the client. One window is for the connecting and the other is for monitoring.
We will use the program nc. On some systems this program is called ncat or netcat.
Server computer – Connecting window
Start the server
[…]$ nc -kl 10373
Server computer – Monitoring window
The server should be listening for connections.
[…]$ netstat -a | grep 10373
Client computer – Connecting window
Connect to the server
[…]$ nc 10373
type something here
Client & Server computers – Monitoring window
The server and client should be connected.
[…]$ netstat -a | grep 10373
All windows
Type CTL-C to shut down all the programs.
Connecting to a web server
You can use nc to talk to the
web server. You have to speak HTTP to download
HTML.
You will need to type these commands very carefully.
The blank lines make a difference.
Using HTTP version 1.0
You need a blank line after the GET.
[…]$ nc www.cs.unca.edu 80
GET http://www.cs.unca.edu HTTP/1.0
Using HTTP version 1.1
You need a blank line after the Host.
[…]$ nc www.cs.unca.edu 80
GET / HTTP/1.1
Host: www.cs.unca.edu
Being a web server
Pretend like you are a web server and use nc to finish the refresh.