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First QoS policy Implemented at Wireless Network of Los Andes University

First QoS policy Implemented at Wireless Network of Los Andes University. One of the aims of wireless networks, just like others network technologies, is support added value. Understand technical issues of wireless networks and their installation procedures requires a considerable

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First QoS policy Implemented at Wireless Network of Los Andes University

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  1. First QoS policy Implemented at Wireless Network of Los Andes University

  2. One of the aims of wireless networks, just like others network technologies, is support added value. • Understand technical issues of wireless networks and their installation procedures requires a considerable effort.

  3. However, maintenance, supervise and monitoring the network, requires a constant effort in order to keep all services available. • In order to make easier all of these administration tasks, a QoS policy help us to avoid some saturation problems in the network.

  4. Inter state structure Tachira Trujillo Mérida Barinas Caracas

  5. Main Router Internet ICNET RAS Firewall Intercable Carmona Hospital Caracas Barinas Táchira Trujillo Wlink Firewall Edif Adm. Cecalcula Backb Switch Tulio Febres Rectorado Hechicera Liria Farmacia Forestal RAS La Aguada El Zamuro 1000 Merida City 100 1500 1000 3000 1500 2000 1000 wireless clients 4000

  6. 50 Kilometers with F.O. Giga Ethernet - Wireless network covers approximately 500 km² Backbone node connected to F.O (Will be 5.8) 49 clients nodes 2.4 7 clients nodes 915 La Aguada

  7. ULA´s wireless network was only for academic use, however • some remote departments started to use this in order to read • e-mail in text mode. • Many different applications made apperance which increase • the consumption of the network resources (P2P, binaries • files attached in e-mails, etc)

  8. Initially we disconnected manually each client that hogged the • bandwith. • We started to evaluate differents inexpensive ways to avoid this problem

  9. Monitoring Tools: ntop, mrtg, smokeping

  10. Main PC router Tests made in the lab First test: enabling RTS and Sen. in all cards start ftp 192 KB start ftp 90 KB FTP server start ftp 192 KB start ftp 92 KB

  11. Main PC router Tests made in the lab Second test: disabling RTS and Sen. in all cards start ftp 380 KB start ftp 91 KB start a second ftp, then the bandwith is hogged by this machine. FTP server start ftp 188 KB A third client could not start the ftp connection

  12. Main PC router Tests made in the lab Third test: Keeping the same conditions as the last test and the ftp connections still open CBQ was started All clients download the files at the same rate (60 Kbps) FTP server

  13. Software used: iproute: software designed to use the advanced networking capabilitiesof the Linux 2.2.x kernel Shapecfg: this program configures and adjusts traffic shaper bandwidthlimiters (CBQ script)

  14. CBQ Configuration File [root@enlace-adm root]# more /etc/sysconfig/cbq/cbq-test DEVICE=eth1,11Mbit,1Mbit #device where we do control our traffic (wireless card) #REAL ethernet card bandwidth #as a rule of thumb weight=batdwidth/10 RATE=600Kbit #Shaper's speed - Kbit,Mbit or bps (bytes per second) WEIGHT=1Kbit #"weight" of shaper (CBQ class). #Like for DEVICE - approx. RATE/10 PRIO=5 #shaper's priority from 1 to 8 RULE=150.185.178.130 #Rule of the shaper

  15. Things to do Ajust the rate and define some rules in order to optimize the usage of the wireless network Find out the way to use the entire bandwith when all of the clients are not connected

  16. Thank you!

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