802'11 Wireless Bonding

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802.11 Wireless Bonding

• JiWook Kim, Youngseok Lee,
• Chungnam National University
• kjw, lee_at_cnu.ac.kr

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Contents

• Motivation
• Goal
• The Bonding Driver
• Work Done
• Experiment
• Future Work
• References

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1. Motivation

• Is the real speed of an wireless lan card 54Mbps
  ?
• How can I get high performance using software ?
• Im interested in wireless network.
• This is my graduate project.

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2. Goal

• bond multiple wireless network interface cards

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3. The Bonding Driver

• The bonding driver is exist in Linux Kernel.
• The bonding driver allows a set of interfaces to
  be grouped together and be treated as a single
  interface.1

Virtual Device
NIC 1
NIC 2
NIC 3

• High Performance High Availability

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4. Work Done

• Source Code Analysis
• I analyzed the bonding driver and madwifi driver
  source code.
• Bonding Multiple Wireless Lan Cards
• Bonding driver, macchanger2
• I use Linux bonding driver to bond multiple
  wireless lan cards. For convenient, make some
  shell script when I bond multiple wireless lan
  cards.
• Make an Environment to Test
• Performance Test
• Iperf3 TCP/UDP Bandwidth Measurement Tool
• Nprobe4, NFAMonitoring5 Flow, RTP
  Monitoring Program

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5. Experiment

• Hardware Specification
• 3Com Wireless 11a/b/g PCI Adapter 3CRDAG675B
• ipTIME 7/4dBi G007 Dual Band Omni Antenna
• 2 Pentium 4 CPU 2.8GHz

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5. Experiment

• 802.11a, adhoc demo mode no beacon frame
• TCP
• Not bonding case
• 2 NICs
• 3 NICs
• 4 NICs

• UDP
• Not bonding case
• 2 NICs
• 3 NICs
• 4 NICs

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5. Experiment

• Performance Test
• iperf
• Total transmit time 5 Minutes
• Time between periodic bandwidth reports 1 Sec

• TCP

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5. Experiment

• Performance Test
• iperf
• Total transmit time 5 Minutes
• Time between periodic bandwidth reports 1 Sec

• UDP

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5. Experiment
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5. Experiment
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5. Experiment
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5. Experiment

• DVTS6 Test Bed

802.11a, ad-hocchannel 36, 64
802.11a, ad-hocchannel 36, 64
Receiver
Sender
bond0
ieee1394
bond0
eth0
eth0
10.0.1.1
10.0.0.1
10.0.1.2
10.0.0.2
10.0.2.2
10.0.2.1
Monitoring Here nprobe
- Throughput, Delay, Jitter
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5. Experiment
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6. Future Work

• What happen when bonding machine communicates
  with not bonding machine via wireless network?

(b)
(a)
Multi-port bridge
Multi-Channel bridge?
communication possible?
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7. References

• 1 Understanding The Linux Network Internals 2nd
  Edition
• 2 macchanger, http//www.alobbs.com/macchanger
• 3 Iperf, http//dast.nlanr.net/Projects/Iperf
• 4 Nprobe Improved by Hyun Gu,
• http//networks.cnu.ac.kr/moniwiki/wiki.
  php/rtpMeasurement
• 5 NFAMonitoring RTP measurement,
• http//networks.cnu.ac.kr/moniwiki/wiki.
  php/rtpMeasurement
• 6 DVTS, http//www.sfc.wide.ad.jp/DVTS/

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Thanks Do you have any question?