SimpleRouter

This project implements a fully functional IP router that routes real network traffic.

Goal of the Project

The aim of the project is to implement the following basic router functionalities. The router is declared to be functioning correctly if and only if:

• The router can successfully route packets between the firewall and the application servers.
• The router correctly handles ARP requests and replies.
• The router correctly handles traceroutes through it (where it is not the end host) and to it (where it is the end host).
• The router responds correctly to ICMP echo requests.
• The router handles TCP/UDP packets sent to one of its interfaces. In this case the router should respond with an ICMP port unreachable.
• The router maintains an ARP cache whose entries are invalidated after a timeout period (timeouts should be on the order of 15 seconds).
• The router queues all packets waiting for outstanding ARP replies. If a host does not respond to 5 ARP requests, the queued packet is dropped and an ICMP host unreachable message is sent back to the source of the queued packet.
• The router does not needlessly drop packets (for example when waiting for an ARP reply).

Testing the Router

At a minimum, and in addition to the required functionality above, the router should successfully pass the following tests:

• Pinging both application servers in your topology.
• Pinging the interfaces on the router.
• Tracerouting to both application servers.
• Tracerouting to the router interfaces.
• Downloading large files from the application servers.

For more information check Stanford Virtual Network System.

Partners

• Wassim Itani
• Ahmad El Hajj

References

Ayman Kayssi, American University of Beirut, More.