![]() source address - address of station device, also radio transmitter addressĬonsidering that every frame must include radio transmitter and receiver address, it is clear that 3 address frame format is not suitable for transparent L2 bridging over station, because station can not send frame with source address different from its address - e.g.source address - address of originator of particular frameįrame transmitted from station to AP has the following addresses:.radio transmitter address - address of AP.destination address - address of station device, also radio receiver address.Frame transmitted from AP to station has the following addresses: According to 802.11, AP can transparently bridge traffic between X and STA, but it is not possible to bridge traffic between AP and Y, or X and Y.Ĩ02.11 standard specifies that frames between station and AP device must be transmitted in so called 3 address frame format, meaning that header of frame contains 3 MAC addresses. Where X-to-AP and STA-to-Y are ethernet links, but AP-to-STA are connected wirelessly. Historically 802.11 AP devices were supposed to be able to bridge frames between wired network segment and wireless, but station device was not supposed to do L2 bridging. Beware that such connection will not behave as expected with respect to L2 bridging. It is possible that connection between station and AP will be established even if particular mode is not supported for given protocol. Please refer to applicability matrix for information on mode support in protocols. If L2 bridging over wireless link is not necessary - as in case of routed or MPLS switched network, basic mode=station setup is suggested and will provide highest efficiency.Īvailability of particular station mode depends on wireless-protocol that is used in wireless network. This directly affects the ability of wireless link to be part of L2 bridged infrastructure. Primary difference between station modes is in how L2 addresses are processed and forwarded across wireless link. This article attempts to describe differences between available station modes. The connection between station and AP will behave in slightly different way depending on type of station mode used, so correct mode must be chosen for given application and equipment. ![]() Wireless interface in any of station modes will search for acceptable access point (AP) and connect to it.
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