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    README file for Assignment 4 - Simple Firewall

           Name: 
 Username/Login: 
 
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Briefly describe how you confirmed (tested) your router had each of
the *Required Functionalities* (Yes, some of these are very easy to
check, this is not a trick question:

* The binary file for your firewall is called sr and it accepts the
  -R, -L, and -F flags (for the rule table, log file, and flow table
  size).

* The firewall allows us to ssh into the application server.


* The firewall defaults to blocking external to internal connections.


* The firewall defaults to allowing internal to external connections,
  and traffic flows in both directions.


* The firewall correctly handles inbound flow rules.


* The firewall correctly handles outbound flow rules.


* The firewall logs all dropped packets in a file called drop_log.


* The firewall responds with an ICMP Destination Unreachable (Port
  Unreachable) message when the flow table is full.


* Entries in the firewall's flow table are correctly refreshed and
  timed out.

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DESCRIBE YOUR CODE HERE AND DESIGN DECISIONS YOU MADE

This needs to be at least an entire paragraph.