WLAN
- 1. Conectividad inalámbrica
Seminario a distancia.
Juan Carlos Marino
Systems Engineer
jumarino@cisco.com
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- 3. Wi-Fi Notebooks superan a los Desktops
Notebooks
51 superan
Months
Desktops!
14 Months
80%
70%
1st Million APs
60%
50%
Desde 1999 le tomó a Cisco 51 meses para vender 1 millón de APs.
2nd Million APs
40%
30%
Notebooks
Desktops
Desde 2004 le tomó a Cisco 14 meses para vender 1 millón de APs.
10 Months
3rd Million APs
20%
10%
0%
2002 2003 2004 2005 2006 2007 2008
95% de los Notebooks de hoy tienen Wi-Fi
Para el 2006, se proyecta que le tomará 10
meses a Cisco para vender 1 millón de APs
AP Sales
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- 4. La movilidad cambia la forma de trabajar
Today
Interacción de tiempo real –
Instant Messaging, two-way
text paging, Blackberry, etc
1990s-2002
Voice Mail y Email proveen
respuesta “en el día”
1950s-1990s
Cartas y memos
El clima de negocios actual requiere conectividad en
todo lugar y momento
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- 5. Soluciones inalámbricas
WLAN
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- 6. Interrogantes comúnes
• Cada cuantos metros pongo otro AP?
• Que antena utilizo?
• Cuantos clientes simultáneos por AP?
• Es segura la conectividad inalámbrica?
• La red inalámbrica va a reemplazar a la red
cableada?
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- 7. Extendiendo la red sin usar cables
In-Building Wireless LANs Wireless Bridges
Public Access Hot Spots Home Networking
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- 8. Algunas consideraciones
Aspectos edilicios influyen en el In-Building Wireless LANs
Funcionamiento de la solución
Las columnas y objetos pueden generar
Focos de sombra
No es preferible que sobre antes de que falte J,
El dimensionamiento de las celdas debe ser el
justo y necesario
Los APs no deberían estar instalados en contacto
con superficies metálicas
Los hornos de microondas pueden generar
Interferencia si están deteriorados y no encierran
Adecuadamente la RF
En entornos de empresa los equipos deben soportar WPA u 802.11i
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- 9. Soluciones INDOOR
Infraestructuras
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- 10. Infraestructuras WLAN
Red Ad-Hoc
Red Infraestructura - roaming Red Infraestructura - repeater
LAN
15% 50%
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- 11. Infraestructuras WLAN
Maximum Coverage
Auto Rate Negotiation
Wireless Mobile Workers
DiPole Antennas
1
Office 1 Office 3
Class 1
AP’s on Isolated
LAN with PIX
6 11 1
Office 2 Office 4 Office 5 Office 6 Office 7 Office 8
Hallway
Office 9 Office 10 Office 11 Conference Room Break Room
11 1 11
2000’
850’
6
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- 12. Vistazo a la tecnología
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- 13. Tecnologías Inalámbricas
WAN
(Wide Area Network)
MAN
(Metropolitan Area Network)
LAN
(Local Area Network)
PAN
(Personal Area
Network)
PAN LAN MAN WAN
GSM, GPRS,
CDMA, 2.5-3G
802.11
MMDS, LMDS
802.11a, 11b, 11g
Standards Bluetooth HiperLAN2
Speed < 1 Mbps 2 to 54+Mbps 22+ Mbps 10 to 384 Kbps
Range Short Medium Medium-Long Long
Enterprise networks Fixed, last mile access cellular access Peer-to-Peer
PDAs, Mobile Phones,
Applications Device-to-Device
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- 14. Tecnologías Inalámbricas
802.11b 802.11a 802.11g
2.4 GHz 5 GHz 2.4 GHz
Worldwide US/AP Worldwide
11 Mbps 54 Mbps 54 Mbps
Las leyes del radio:
Mayor tasa de tx. = menor alcance
Mayor potencia = mayor alcance, menos tiempo de bateria
Mayor frecuencia = mayor tasa de tx., menor alcance
Frequency
Band
Availability
Maximum
Data Rate
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- 15. Comparing 802.11 Technologies
Banda de
Frecuencias y
canales
disponíbles
Tipo de
transmisión y
Tasas de
Transferencia
(Mbps)
802.11b DSSS: 11, 5.5, 2, 1
2.4GHz, 3
Channels
2.4GHz, 3
Channels
5GHz, 12
Channels
Alcanca
aproximado
(indoor)
a máxima
velocidad
150 feet@
11Mbps
90 feet@
54Mbps
45 feet@
54Mbps
OFDM: 54, 48. 36,
24, 18, 12, 9, 6
DSSS: 11, 5.5, 2, 1
OFDM: 54, 48. 36,
24, 18, 12, 9, 6
802.11g (802.11b
Clients in Cell)
802.11a
• 802.11b provee largo alcance pero velocidad, throughput y capacidad
limitadas
• La alta velocidad, largo alcance y compatibilidad con 802.11b son los
beneficios claves de 802.11g
La capacidad está limitada a los canales disponíbles
• 802.11a, operando en 5.8GHz es la tecnología de mayor capacidad
Pero tiene alcance limitado y no es compatible con 802.11b ni 802.11g
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- 16. 802.11 Capacity Compared
Throughput Channels Capacity (Mbps)
(Mbps)
802.11b 6 3 18
802.11g (Mixed 8 3 24
Mode Operation)
802.11g (No 22 3 66
Legacy Support)
802.11a 25 12 300
802.11a (with 25 24 600
802.11h Support)
• Even when not supporting 802.11b clients, 802.11g still provides a
fraction of the network capacity provided by 802.11a
• Dual band infrastructure is the only way to achieve a high capacity
wireless LAN
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- 17. Comparative 802.11a, 802.11b and 802.11g
Ranges in an Open Office Environment
802.11b (100 mW
with 2.2 dBi Gain
Diversity Dipole
Antenna)
802.11g (30 mW with
2.2 dBi Gain
Diversity Dipole
Antenna)
802.11a (40 mW with
6dBi Gain Diversity
Patch Antenna)
Range
Data Rate (Mbps)
54 45 ft (13 m) 90 ft (27 m) -
48 50 ft (15 m) 95 ft (29 m) -
36 65 ft (19 m) 100 ft (30 m) -
24 85 ft (26 m) 140 ft (42 m) -
18 110 ft (33 m) 180 ft (54 m) -
12 130 ft (39 m) 210 ft (64 m) -
11 - 160 ft (48 m) 160 ft (48 m)
9 150 ft (45 m) 250 ft (76 m) -
6 165 ft (50 m) 300 ft (91 m) -
5.5 - 220 ft (67 m) 220 ft (67 m)
2 - 270 ft (82m) 270 ft (82m)
1 - 410 ft (124 m) 410 ft (124 m)
• Multiple rate/range combinations allow two different paths:
New site survey and additional devices for common data rate
Upgrade existing APs for asymmetric data rate coverage
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- 18. Canales - 802.11 DS
o(11) canales estacionarios de 22 MHz
o 3 canales no superpuestos
o 3 Access Points pueden estar co-ubicados
1 2 3 4 5 6 7 8 9 10 11
2400
2483
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- 19. Frequency Hopping
Existe interferencia con los teléfonos inalámbricos?
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- 20. El espectro de 5 GHz
5GHz 5.15 5.35 5.470 5.725 5.825
UNII Band
US (FCC)
12 Channels
(*can use up to
6dBi gain antenna)
Europe
19 Channels
(*assumes no
antenna gain)
5.25
4 Ch 4 Ch 11 Ch 4 Ch
UNII-1
40mW
UNII-2
200mW
200mW 1W
UNII-1: Uso Indoor, la antena debe estar ligada al radio
UNII-2: Uso Indoor/Outdoor, antena fija o remota
UNII-3: Solo Outdoor Bridging
UNII-3
800mW
*if you use a higher gain antenna, you must reduce the transmit power accordingly
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- 21. Distorsión por múltiples caminos
Las dos antenas se comportan como una sola
Deben estar levemente distanciadas una de la otra. Ambas antenas
deben ofrecer la misma celda de cobertura
El AP escoge automáticamente por cual de las dos antenas va a
escuchar el tráfico y por cual va a recibir.
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- 22. Soluciones INDOOR
Productos
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- 23. In-Building Wireless LANs
Cisco Aironet 1100 Series Access Point
Estandares: 802.11b y 802.11g
Velocidades: 11Mbps en .11b y 54Mbps en .11g
Alimentación: Inline Power (via UTP) o bien con fuente externa
Solo para ambientes indoor
Antenas internas de 2.2dBi. No soporta otra antena.
Cisco Aironet 1200 Series Access Point
Estandares: 802.11b , 802.11g y 802.11a
Velocidades: 11Mbps en .11b y 54Mbps en .11g y .11a
Alimentación: Inline Power (via UTP) o bien con fuente externa
Soporta condiciones de temperatura y humedad de ambientes hostiles
Dos conectores RP-TNC para soportar diversas antenas.
(al instalar dos antenas, éstas se comportan como una única antena. La
posibilidad de instalar dos antenas le permite al AP superar dificultades
propias de la transmisión inalámbrica tales como rebotes de señal.)
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- 24. In-Building Wireless LANs
Cisco Aironet 1130 Series Access Point
Estandares: 802.11 a,b,g
Velocidades: 11Mbps en .11b y 54Mbps en .11a y g
Alimentación: Inline Power (via UTP) o bien con fuente externa
Solo para ambientes indoor
Antenas internas:
2.4GHz - 3dBi
5.8GHz – 4.5dBi
no soporta antenas externas
Cisco Aironet 1230AG Series Access Point
Estandares: 802.11 a,b,g
Velocidades: 11Mbps en .11b y 54Mbps en .11a y g
Alimentación: Inline Power (via UTP) o bien con fuente externa
Indoor - robusto
Antenas internas – no tiene
Soporta antenas externas para 2.4GHz y 5.8GHz
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- 25. Clientes Inalámbricos y antenas
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- 26. Cisco Aironet 802.11a/b/g Wireless Adapters
• PCMCIA card para Laptops y PDAs
• PCI adapter para Desktops
• Mini-PCI for embedded applications
• Driver Support
Windows 95, 98, Me, NT 4.0, 2000, XP
Windows CE 2.11, 3.0 (Pocket PC)
Linux
Mac OS 9, X
• Los utilitarios incluyen una herramienta de
configuracion de usuario y de site survey
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- 27. Tipos de antena
OMNI PATCH YAGI
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- 28. Lobulos de radiación
Frequency Range à 2.4-2.484 GHz
VSWR Less than à 2:1
Power à 5 watts
Gain à 2dBi
Polarization à Linear
Azimuth 3dB BW à Omnidirectional
Elevations 3dB BW à 70 degrees
Antenna Connector à RP-TNC
Dimensions (H) à 4.5 in.
Mounting à To RP-TNC Connector
Frequency Range à 2400-2500 MHz
Gain à 12dBi
Polarization à Linear, Vertical
Azimuth 3dB BW àOmnidirectional
Elevation (3dB BW) à 7 degrees
Antenna Connector à RP-TNC
Dimensions (H x W) à 42 x 1.25 in.
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- 29. Lobulos de radiación
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- 30. Interrogantes comúnes
• Cada cuantos metros pongo otro AP?
• Que antena utilizo?
• Cuantos clientes simultáneos por AP?
• Es segura la conectividad inalámbrica?
• La red inalámbrica va a reemplazar a la red
cableada?
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- 31. Soluciones OUTDOOR
Infraestructura
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- 32. Wireless Bridges
Algunas consideraciones
Debe existir linea de vista
Se debe respetar la zona de fresnel
La lluvia o humedad no debería afectar notoriamente
al enlace
Se deben tomar recaudos frente a posibles descargas eléctricas
Se deberían registrar los enlaces ante la CNC
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- 33. Enlaces entre sitios
50 Mbps
14 Mbps
14 Mbps
•Punto a Punto
•Punto - Multipunto
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- 34. Soluciones OUTDOOR
Productos
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- 35. Cisco Aironet 1400 Series
AIR-BR1410A-A-K9 AIR-BR1410A-A-K9-N
• Al soportar instalción outdoor, maximiza la performance al
reducir la pérdida por uso de cables de radio.
• Transmit Power: 15 mW (12 dBm) - 250 mW (24 dBm)
• Data rates: 6 to 54 Mbps con la mayor sensibilidad de radio
del mercado
• Point to point range con antena integrada de 22.5 dBi:
7.5 miles at 54 Mbps
16 miles at 9 Mbps
• Point to point range con antena de 28 dBi:
12 miles at 54 Mbps
23 miles at 9 Mbps
• Point to multi-point range con antena omni de 9 dBi y
antena de 22.5 dBi:
2 miles at 54 Mbps
8 miles at 9 Mbps
• Throughputs mayores a 28 Mbps a 7.5 miles
• VoIP circuits trunked – up to 24 over PtP links
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- 36. 1300 Series Access Point / Bridge
• Estándar: 802.11g
• Puede funcionar en modo Bridge o en modo Access Point.
• Se puede limitar para permitir solo tráfico entre dos BRs, sin aceptar clientes
Modelos:
AIR-BR1310G-A-K9
Con antena direccional de 22.5dBi incorporada
AIR-BR1310G-A-K9-R
Con conectores RP-TNC para antena externa
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- 37. ¿Es segura una WLAN?
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- 38. Ataques a WLAN
Jamming
DoS (Denegación de Servicio)
MITM (Man in the middle)
Rogue Aps
Password Attacks (Dictionary / Brute Force)
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- 39. Limitaciones de la seguridad de 802.11
• Claves WEP estáticas y
compartidas
Administración de claves
descentralizado
Protección pobre contra ataques
• No existe una manera efectiva de
lidear con placas robadas
El poseedor tiene acceso a la red.
Se precisa hacer una distribución de
claves nuevas a todos los dispositivos
• No hay administración de
usuario integrada
Se necesitan DB de usuarios
independientes. No se puede usar
RADIUS
Solo se identifica al usuario por
MAC address.
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- 40. Resumen de seguridad 802.11
• Los mecanismos de seguridad en la especificación
802.11 de 1997 fueron burlados
Open authentication
Shared key authentication
WEP
• Estos EN SI MISMOS no van a segurizar su red
wireless
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- 41. Requisitos para una WLAN segura
Encryption and
Data Privacy
Authentication
and Access
Control
Encryption
Algorithm
Message
Integrity
TKIP-MIC or
AES-CBC-MAC
Authentication
Algorithm
TKIP-PPK or
AES-CCM
Authentication
Framework
802.1X/EAP LEAP, PEAP,
or EAP-TLS
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- 42. Seguridad WLAN
802.11 802.11i + WPA2
HAONGTAAÑO
+ WPA
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- 43. Cisco Wireless Security Suite
No
Security
No WEP and
Broadcast Mode
Public
Access
Basic
Security
Wi-Fi 40-bit,
128-bit, and
Static WEP
Telecommuter and
Small Business
Enhanced
Security
Dynamic Key
Management
System, Mutual
Authentication, and
802.1x via EAP
Mid-Market and
Enterprise
Specialized
Security
End-to-end
security using VPN
Mobile User and
Public Access
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- 44. Interrogantes comúnes
• Cada cuantos metros pongo otro AP?
• Que antena utilizo?
• Cuantos clientes simultáneos por AP?
• Es segura la conectividad inalámbrica?
• La red inalámbrica va a reemplazar a la red
cableada?
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- 45. Cisco Unified Wireless Network
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- 46. Cisco Unified Wireless Network
End-to-End, Unified – Only Cisco
Unified Advanced Services
Unified built-in support of leading edge applications
- not an after thought. Cisco Wireless Location
Appliance, Cisco WCS, SDN, NAC, Wi-Fi phones,
and RF firewalls.
World-Class Network Management
World Class NMS that visualizes and helps secure
your air space. Cisco Wireless Control System (WCS)
Cisco
Self-Defending
Network
Network Unification
Seamless network infrastructure across a range
of platforms. Cisco 4400, 2000 Wireless LAN
Controllers and Cisco Catalyst 6500 Series WiSM.
Future ISR integration.
Mobility Platform
APs dynamically configured and managed
through LWAPP. Cisco Aironet Access Points:
1500, 1300, 1240AG, 1230AG, 1130AG, and 1000.
Client Devices
Secure clients that work out of the box. Cisco
Compatible Client Devices & Cisco Aironet clients.
Future
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- 47. Cisco Unified Wireless Network
¿Como funciona y que hace?
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- 48. Real-Time RF Management
Dynamic RF channel “1”
Channel
RF channel “2”
Assignment
Dynamic
Power
Optimization
RF channel “3”
Cisco Hardware Layer
• Avoid interference & Improve performance
• Reduce “hands on” WLAN management
Cisco Aironet
Access Points
• Eliminate coverage holes
• Optimize coverage area
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- 49. Better Network Performance
Dynamic Load Balancing
Solving Performance & Capacity problems in high density
areas (e.g. conference rooms, cafeteria)…
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- 50. Better Network Performance
Dynamic Load Sharing
Solving Performance & Capacity problems in high density
areas (e.g. conference rooms, cafeteria)…
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- 51. Better Network Performance
Dynamic Load Sharing
Solving Performance & Capacity problems in high density
areas (e.g. conference rooms, cafeteria)…
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- 52. Enterprise-Class Security
Cisco Self-Defending Network
Threat Defense
Trust and
Identity
Protect the Servers:
• Integrated Firewalls
Integrated Security
Management and Control
Protect Against Network-based
Attacks Ø Wireless more secure than wired
Defend the Applications:
• Integrated Network WIDS
Rogue AP Detection and Containment
Signature Detection and Remediation
WLAN MFP
RF Jamming Remediation
Verify the User and Device:
• Identity-Based Networking, CSA
+ NAC, RF Firewall, Blacklisting
Authenticate Who/What Has Access
Ø Multi-layered security
Ø Unification with Cisco Secure
ACS, CS-MARS
Ø Uniform security framework
across wired and wireless
network
Ø Protection from unauthorized
access and rogue devices
Secure and Encrypt Transport:
• WPA2/AES
Provides Data/Voice Confidentiality
• IPSec VPNs
• X509 Certificates
Secure Control Channel
Secure
Connectivity
Hackers Employees
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- 53. Location Tracking Services
• 1ra solución integrada de
localización
• Servicios de localización en
tiempo real
• Identificación y autenticación
única a través de RF
• Rastreo en simultáneo de mas de
10.000 dispositivos
• Aplicaciones de terceras partes
(API)
• Admisnistración de la capacidad
de RF
• Interfaz de administración gráfica
intuitiva
Cisco 2700 Series Wireless Location Appliance
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- 54. Interrogantes comúnes
• Cada cuantos metros pongo otro AP?
• Que antena utilizo?
• Cuantos clientes simultáneos por AP?
• Es segura la conectividad inalámbrica?
• La red inalámbrica va a reemplazar a la red
cableada?
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- 55. Más información sobre Cisco Aironet:
http://www.cisco.com/go/wireless
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