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20120407 hklug-os-workshop-5-wifi-mesh

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Mesh networks using commodity WiFi routers and OpenWRT. …

Mesh networks using commodity WiFi routers and OpenWRT.

Presentation at Open Source Workshop #5 (7 Apr 2012) @CityU Hong Kong

Published in: Technology
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  • 1. Mesh networksusing commodity WiFi routers and OpenWRT Alexander List <alex@wurzel.at>Open Source Workshop #5 (7 Apr 2012) City University of Hong Kong
  • 2. Network topologies http://en.wikipedia.org/wiki/Network_topology
  • 3. Mesh networkhttp://en.wikipedia.org/wiki/Wireless_mesh_network
  • 4. WiFiIEEE 802.112.4 GHz ISM band (100 mW EIRP), ch. 1-14 60 MHz → 3 non-overlapping channels (1/6/11)5 GHz ISM band (up to 1W EIRP) Indoor channels (5.15 – 5.25 GHz, ch. 36-48) Outdoor channels (5.25 – 5.6 GHz, ch. 52-140)Always check national regulation (HK: OFCA)
  • 5. Typical WiFi deployment(c) eTutorials.org
  • 6. 802.11 modesInfrastructure mode (STA → AP) Home network Office CaféAd-hoc mode (STA-STA) Mac OS “create network” (AirPort menu) Linux: iwconfig wlan0 mode Ad-Hoc Ubuntu: using Network Manager
  • 7. Commodity hardwareLinksys WRT54G series GL runs Linux
  • 8. WiFi chipsets
  • 9. China: TP-LinkTL-WR703N: 57x57x18mm, ~RMB 95 57x57x18mm Atheros AR7420, 4MB flash, 32MB RAM 1x 10/100 Mbit/s Ethernet, USB 2.0, 802.11nTL-WR743ND: ~200 HKD Atheros AR7420, 4MB flash, 32MB RAM 5x 10/100 Mbit/s Ethernet, 802.11nTL-WR1043ND: ~390 HKD Atheros AR9132, 8MB flash, 5x GigE, 3xMIMO
  • 10. Buying hardwareCheck http://wiki.openwrt.org/toh for supportGo for more flash (≥ 8 MB)Detachable antennas12V DC power supplySeveral LAN ports
  • 11. OpenWRT
  • 12. OpenWRTLinux kernelOwn build/packaging systemOriginally derived from Linksys WRT54G GPL sourcesActive community, supports 100s of devicesMesh network protocols availableAsterisk, MySQL, ...
  • 13. Wireless mesh protocolshttp://battlemesh.org/OLSR, B.A.T.M.A.N., Babel, BMX, 802.11s, ...
  • 14. Wireless community networksGermany: Freifunk in several citiesAustria: FunkFeuer (120/200 nodes)Athens: AWMN (2433 nodes)Barcelona: guifi.netOverview: http://en.wikipedia.org/wiki/List_of_wireless_community_networks_by_region
  • 15. FunkFeuer Graz
  • 16. AWMN
  • 17. Spain: guifi.net
  • 18. Asia?!India: AirJaldiIndonesia: BWICNepal: nepalwireless.net
  • 19. What do we need?
  • 20. Lets get this party started...When:Saturday, May 12, 2012, 14:00-17:00Where:DimSumLabs, 14/F, 100-102 Jervois Street, Sheung WanBring:Laptop, WiFi router supporting OpenWRT
  • 21. Thank you!

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