A while ago you bought and installed a network interface card to your
virtual computer (which manifests itself as device "eth0"). It would be a
pity to not use it, wouldn't it?

1. In order to use the network card, you need to configure it first. All
   virtual computers are currently connected to one big network. So
   configure them "The Proper Way"(tm)! In this netwok they have addresses
   like 10.0.0.x, where 'x' is number of your virtual computer -- the same
   number you useto connect to your virtual computer (e.g. if your assigned
   port is 44123, configure your computer so its address would be
   10.0.0.123).

   Although it was already indirectly said, just to be sure we emphasize
   that mask of this network has 24 bits.

   Note: As you already know, the command you are looking for is 'ifconfig'.

2. If you configured network connection correctly, try 'ping'-ing computer
   with the IP address 10.0.0.254, of computers of your neighbors. Could you
   find out, who already managed to (correctly) configure network?

3. In order to not configure these settings every reboot over and over
   again, have a look at /etc/network/interfaces and modify it, so after starting
   virtual computer, network will be available "automatically".

4. This network with virtual computers is not the only one -- there is also
   network 192.168.0.0/24 (do you know what does "/24" mean?). Moreover,
   these networks are interconnected via computer with IP address
   10.0.0.254 (which is visible as 192.168.0.254 from the other side).

   How to configure it, so you could access computers from the other network
   directly?

   Note: Command 'route' might be quite useful.

5. You can easily check whether you've dont assignment 4 the right way --
   just ping host with IP address 192.168.0.1; if you'll get the reply,
   everything is fine. Are there also other computers in that network?

6. Imagine you could access, instead of only this small network, the whole
   internet via 192.168.0.254 . How would you set up routing in this case?

7. Well, and if you managed to do everything correctly, at last we have a
   small arithmetic exercise for you :-) Fill in the missing values to the
   table below:

Computer in net     Network addr    Network mask       Broadcast adresa
198.81.129.100                      /18
158.195.16.244                      255.255.254.0
18.7.22.83                          /8