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# SPDX-License-Identifier: GPL-2.0-only # # LAPB Data Link Drive # config LAPB tristate "LAPB Data Link Driver" help Link Access Procedure, Balanced (LAPB) is the data link layer (i.e. the lower) part of the X.25 protocol. It offers a reliable connection service to exchange data frames with one other host, and it is used to transport higher level protocols (mostly X.25 Packet Layer, the higher part of X.25, but others are possible as well). Usually, LAPB is used with specialized X.21 network cards, but Linux currently supports LAPB only over Ethernet connections. If you want to use LAPB connections over Ethernet, say Y here and to "LAPB over Ethernet driver" below. Read <file:Documentation/networking/lapb-module.rst> for technical details. To compile this driver as a module, choose M here: the module will be called lapb. If unsure, say N.