Changes

* # On your fedora host execute the command <code>netstat -at</code>* # This command will list all active TCP ports. Note the state of your ports.* # TCP is a connection oriented protocol that uses a handshaking mechanism to establish a connection. Those ports that show a state of LISTEN are waiting for connection requests to a particular service. For example you should see the <code>ssh</code> service in a LISTEN state as it is waiting for connections.* # From one of your VM's login to your host using <code>ssh</code>* # On the fedora host rerun the command and in addition to the LISTEN port it should list a 2nd entry with a state of ESTABLISHED. This shows that there is a current connection to your ssh server.* # Exit your ssh connection from the VM and rerun the command on the fedora host. Instead of ESTABLISHED it should now show a state of CLOSE_WAIT. Indicating that the TCP connection is being closed.* # On your fedora host try the command <code>netstat -atn</code>. How is this output different?* # Without the <code>-n</code> option <code>netstat</code> attempts to resolve IP addresses to host names (using /etc/hosts) and port numbers to service names (using /etc/services)* # Examine the <code>/etc/services</code> file and find which ports are used for the services <code>ssh ftp http</code>* # Now execute the command <code>netstat -au</code> What is the difference between <code>-at</code> and <code>-au</code>?* # When examining UDP ports why is there no state?

* # Using the <code>netstat</code> man page and experimentation make sure you understand how the following options work. *#* -at*#* -au*#* -atp*#* -aup*#* -atn*#* -aun*#* -autnp* # Answer the investigation your logbook