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WDS
Wireless Distribution System
Wireless Distribution System
A Wireless Distribution System (WDS) is a networking system that enables wireless access points in an IEEE 802.11 network. It allows a wireless network is expanded through multiple access points without the need for a cable backbone, as is traditionally required. The notable advantage of WDS over other solutions is that it preserves the MAC addresses of client packets across links between access points.
An access point may be a main, relay or remote base station. A main base station is typically connected to the Ethernet cable. A relay or relay base station transmits data between remote base stations, wireless clients and other main stations or a relay of another base station. A remote base station accepts connections from wireless clients and passes them to relay or main stations. Connections between "clients" MAC addresses are used instead of IP addresses.
All base stations in a wireless distribution system must be configured to use the same radio channel, encryption method (none, WEP or WPA) and encryption keys. They can be configured to different service set identifiers. WDS also requires that each base station be configured to relay to others in the system.
WDS may also be referred to as repeater mode because it seems to accept bridge and wireless clients at once (unlike the normal bridges). It should be noted, however, that performance in this method is halved for all clients connected without wires.
WDS can be used to provide two modes of wireless connectivity AP-AP:
- Wireless bridge AP WDS where only communicate with each other and do not allow wireless clients or stations can access
- Wireless Repeater where the APs communicate with each other and with wireless stations
Two disadvantages of using WDS are:
- The actual maximum wireless performance is reduced by half after the first relay (jump) is made. For example, in the case of two routers connected via WDS, and communication takes place between a computer that is connected to a router and a laptop that connects wireless using the router's access point B reduces performance half, because router B has to retransmit the information during communication of both parties. However, in the case of communications between a computer that is connected to a router and a computer that is connected to router B, the performance is not halved, since there is no need to relay information.
- Encryption keys dynamically and rotary asginadas usually are not supported in a WDS connection. This means that Wi-Fi Protected Access (WPA) technology and other dynamic key assignment in most cases can not be used, though WPA using pre-shared keys is possible. This is due to the lack of standardization in this area, which can be resolved with the upcoming 802.11s standard. As a result only static WEP or WPA key can be used in a WDS connection, including any associated station to a WDS repeater AP.
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