tvaz / cs325

code for networking final project

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Checkpoint 3 Requirements

Mac Rules (DONE)

  • 802.11 MAC logic implemented

Address Selectivity (DONE)

  • Only receive packets sent to local MAC/broadcast Address
  • Valid source/dest Address

ACKs

  • Send properly formatted ACK Packet back to the sender
  • don't send acks for the broadcast Address
  • Wait the required amount of time before sending ACK
  • When transmitting, wait for ack before proceeding
  • retransmit according to MAC rules, then move onto next packet
  • (make up a fixed timeout value for now)
  • You don't have to do media-access steps when sending ACKs
  • Packets are dropped after 5 (Dot11 retry limit) attempts
  • Transmissions are resent after 3 seconds (taken from average in tests, could not acquire more accurate estimate due to bugs)

Sequence Numbers

  • Packets do not have valid sequence numbers
  • Numbers start at 0 and maintain a next seq num for each destination
  • ACKs carry the seq num of the packet they are acknowledging ###Known issues
  • Code currently crashes when made to send multiple packets at once (known concurrent modification issue, unknown source)
  • Code occasionally stalls/crashes after unknown amount of time
  • Time outs stop working when connected to network (assumed reason for previous issue)
  • Beacons are not sent
  • Because of sequence bug, transmissions after the first are typically broken due to being out of sequence
  • Limited Buffering is only confirmed for send buffer in non-transmitting environment(receive buffer could not be tested)
  • Sliding window does not behave properly (exact behavior unknown)

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code for networking final project


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