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The E.N.a.A. (Ed Needs an A) Network Bridge

The E.N.a.A. (Ed Needs an A) Network Bridge. An ELE 408 / URI / Miller Brewing Company Presentation. What is a network bridge?. The key component of a multi - tiered network architecture. Connects different Local Area Networks (LANs ) together….

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The E.N.a.A. (Ed Needs an A) Network Bridge

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  1. The E.N.a.A. (Ed Needs an A)Network Bridge An ELE 408 / URI / Miller Brewing Company Presentation

  2. What is a network bridge? • The key component of a multi - tiered network architecture. • Connects different Local Area Networks (LANs ) together….. …… while at the same time keeping each LAN independent of the other one.

  3. Multi - Tier Architecture Bridge Hub Hub LAN 1 LAN 2

  4. What does this mean? • Overall, makes the LAN “better” by extending the “Collision Domain”: • Employs CSMA / CD • Distance • Number of Users • LAN can use its full bandwidth • Less Collisions • All of this is accomplished because the bridge isolates each LAN and is smart enough to tell where to route a packet.

  5. The Bridge Table • Table held in RAM that is dynamically updated. • Holds all LAN addresses that have used the bridge, along with which interface they used. Interface 1 Interface 2 12-34-56-78-9A-BC 1 12-34-56-78-9A-BC

  6. The Program • Initialize both Boards in Receive Mode • When a packet is received through the ethernet port, the data is stored in memory. • If the source address is not in the table, it is added. • If the destination address is not in the table, the packet is sent to the UART transmit buffer, and the transmitter is enabled.

  7. More of the program…. • The packet is stored in memory, if the source address is not in the bridge table, it is added. • The packet is then transferred to the ethernet transmit buffer and passed to the connected LAN.

  8. One problem…. • The $%##%#%#$#%%^^-freakin-$#%^&#@$%%- son of a - $%^#@$% ^ ETHERNET CONTROLLER! • Possibly over 2 million registers to program • Difficult to strip away headers from different network layers

  9. The (temporary) solution • Packets will enter the bridge through the terminal. • Data will be typed in, header information will be stored in memory and then combined with the data to form a simulated packet.

  10. Other problems…... • Scalability • Bandwidth Bottleneck

  11. Future implementations... • Security features • LAN address filtering • Interface firewall • Trusts • Implement Spanning Tree Protocol to facilitate expansion

  12. Conclusion • Effective way to bridge to LANs • Cheap to build, easy (in theory) to implement • Mass production easy due to the fact that its highly software driven • Ed definitely deserves an A

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