KIF345:Arbeitskreise/AP MeshNetwork: Unterschied zwischen den Versionen
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==Praktische Experimente== | ==Praktische Experimente== |
Version vom 9. August 2009, 14:37 Uhr
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Praktische Experimente
Wir haben innerhalb von 45 Minuten ein lokales mesh network aufgebaut. Fairerweise muss dazugesagt werden, dass man ohne technische Vorkenntnisse vermutlich etwas länger braucht.
Vorhandenes Material:
- 2 Linksys WRT54GL (Preis ca. 60€ pro Stück)
- Hub
- Netzwerkkabel
- Laptops
Als erstes mussten die Linksys-Router mit einer neuen Firmware versehen werden, da die vom Hersteller ausgelieferte Firmware kein mesh routing mit OLSR gemäß [RFC 3626] unterstützt. Wir haben uns für die Freifunk-Firmware entschieden, da diese auch im Grazer FunkFeuer-Netz sehr beliebt ist. FreiFunk basiert auf OpenWRT.
Von FunkFeuer Graz wurde uns ein [RFC 1918] Class C-Netz (10.12.24.0) für die KIF zur Verfügung gestellt.
Die IP-Adressvergabe erfolgte via Peg DHCP gemäß [RFC 2322]. Als DHCP-Server diente eine Schachtel.
Ein Linksys (kif1) wurde als 10.12.24.101 konfiguriert und ans Fenster gestellt, ein zweiter (kif2), 10.12.24.111 auf unseren Tisch. Die Verbindung zwischen den beiden Linksys erfolgte natürlich über WLAN.
Nach Konfiguration der beiden Linksys wollten wir natürlich wissen, ob wir vom Studienzentrum aus ins Netz kommen...
In ca. 300m Entfernung (Luftlinie) vom Studienzentrum befinden sich zwei FunkFeuer-Knoten (Sandgasse 23 und Petersgasse 118). Wir haben einen Linksys außen ans Fenster gestellt und eine recht akzeptable Verbindung zu beiden Knoten zustande gebracht: 7 MBit zu Sandgasse 23 (freie Sicht) und 2,5 MBit zu Petersgasse 118 (Gebäude dazwischen). Das Experiment war also erfolgreich :-)
In der Topologie sind wir wunderschön zu sehen: Von suedost.sand23 gibt es Verbindungen zu 10.12.24.101 und 10.12.24.111.
Als Clients waren Laptops unter Ubuntu, Debian, Gentoo, Windows und Mac OS X im Einsatz - auf diesen konnten wir OLSR problemlos installieren. Wenn es Probleme gab, dann mit WLAN-Treibern...
Ein PDA unter Windows CE konnte im Ad Hoc-Modus nicht zu unserem Netz verbinden. Erstens sind wir am fehlenden OLSR-Client gescheitert, und auch ein zweiter Versuch mit statisch konfiguriertem Netzwerk war erfolglos.
Netzwerk-Konfiguration
IP Range: 10.12.24.101 - 10.12.24.120 IP Net: 10.12.0.0/16 DNS: 10.12.240.147 ESSID: kif.graz.funkfeuer.at
Zeitraum des AP: Freitag (8.12.) 10.00h-12.00h (danach Dokumentation) Ort: TU Graz, Campus Inffeldgasse, Studienzentrum (Inffeldgasse 10), 3. Stock
Bezugsquellen für Antennen (beispielhaft):
- eBay
- Interline http://www.interline.pl/
- Datennetz http://www.datennetz.at/
Kontakt: Alex List (TU Graz)