{{node.name}} (IP Address: {{node.address}})

{% if node.is_nameserver %} You are a nameserver, responsible for looking up addresses for your clients. {% else %} {% if node.is_gateway %} You are a gateway router, responsible for directing traffic between two networks. {% else %} You are an ordinary computer on the Internet. {% endif %} Your nameserver is {{node.nameserver}}. {% endif %}

Setup

• Make sure you have a pen or a pencil.
{% if node.is_gateway %}
• Find the place where network {{node.network}} meets network {{node.subnet}} and sit so you can touch both circles.
• Notice who is to your right ( --> ) along the circle of network {{node.network}}. Then notice who is to your right along network {{node.subnet}}.
{% else %}
• Find network {{node.network}} and sit down on the outside of the circle.
• Notice who is to your right ( --> ) along the circle of network {{node.network}}.
{% endif %}

Receiving messages

• When you are handed a message, check to see if it's for you ({{node.address}}). If so, keep it. (And write back!)
{% if node.is_gateway %}
• Otherwise, check whether the message was sent to an IP address that starts with {{node.subnet}}.
  • If it starts with {{node.subnet}}, pass it to the right along network {{node.subnet}}.
  • Otherwise, pass it to the right along network {{node.network}}.
{% else %}
• Otherwise, pass the message to the right along network {{node.network}}.
{% endif %}

Sending messages

• To send a message, fill out a slip of paper with "To", "From", and "Message" fields. When you are ready to send it, pass it to the right {% if node.is_gateway %} (if the address starts with {{node.subnet}}, pass it to the right on network {{node.subnet}}; otherwise pass it to the right on network {{node.network}}). {% else %} along network {{node.network}} as usual. {% endif %}
{% if not node.is_nameserver %}
• You can send messages to whoever you want. First, ask your nameserver for your friend's IP address:
  • To: {{node.nameserver}}
  • From: {{node.address}}
  • Message: What is Toodle Oo's address?
• Once your nameserver writes you back, you can write to your friend:
  • To: 16.17.18
  • From: {{node.address}}
  • Message: Hi Toodle! It's {{node.name}}. Are you going to Homework Club today?
{% else %}
• You can send messages to whoever you want. First, use your Directory to look up the address of the person you would like to write to. Then write a message:
• To: 16.17.18
• From: {{node.address}}
• Message: Hi Toodle! It's {{node.name}}. Are you going to Homework Club today?
• You are a nameserver, so most of the messages you receive will be requests for somebody's IP address. Use the Directory to look up the requested name, and write back.

Directory

{% for name, address in directory %} {% if name != "ROOT" %}
• {{name}}: {{address}}
{% endif %} {% endfor %}