Linux v5.2-rc1 - lapb
# LAPB Data Link Drive
tristate "LAPB Data Link Driver"
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.txt> for technical
To compile this driver as a module, choose M here: the
module will be called lapb. If unsure, say N.