first qos policy implemented at wireless network of los andes university
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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First QoS policy Implemented
at Wireless Network of
Los Andes University
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One of the aims of wireless networks, just like othersnetwork technologies, is support added value.
Understand technical issues of wireless networks and their installation procedures requires a considerableeffort.
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However, maintenance, supervise and monitoring thenetwork, 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.
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Inter state structure
Tachira
CaracasBarinas
Mérida
Trujillo
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Liria
Hechicera
Farmacia
Forestal
Rectorado
Internet
Táchira
Trujillo
Caracas
La Aguada
Barinas
Cecalcula
RAS Firewall
Edif Adm.Firewall
Backb Switch
Main Router
Intercable
ICNETRAS
Tulio Febres
El Zamuro
Carmona
Wlink
wireless clients
Hospital
Merida City
3000
1000
2000
1000
4000
1500
1000
1500
100
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- Wireless network covers approximately 500 km²
La Aguada
Backbone nodeconnected to F.O(Will be 5.8)49 clients nodes 2.4
7 clients nodes 915
- 50 Kilometers with F.O. Giga Ethernet
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ULA´s wireless network was only for academic use, howeversome remote departments started to use this in order to reade-mail in text mode.
Many different applications made apperance which increasethe consumption of the network resources (P2P, binariesfiles attached in e-mails, etc)
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Initially we disconnected manually each client that hogged thebandwith.
We started to evaluate differents inexpensive ways to avoid this problem
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Monitoring Tools: ntop, mrtg, smokeping
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Tests made in the lab
Main PC router
First test: enabling RTS and Sen. in all cards
FTP server
start ftp192 KB
start ftp192 KB
start ftp90 KB
start ftp92 KB
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Tests made in the lab
Main PC router
Second test: disabling RTS and Sen. in all cards
FTP server
start ftp380 KB
start ftp188 KB
start ftp91 KB
start a secondftp, then the bandwith ishogged by thismachine.
A third client could not start the ftpconnection
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Tests made in the lab
Main PC router
Third test: Keeping the same conditions as the last test and the ftp connections still open
FTP server
CBQ was started
All clients download the files atthe same rate (60 Kbps)
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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 bandwidth limiters (CBQ script)
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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
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Things to do
Ajust the rate and define some rules in order tooptimize the usage of the wireless network
Find out the way to use the entire bandwith whenall of the clients are not connected
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Thank you!