Keepalive and linefill

configname: CONFIG_SLIP_SMART

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Keepalive and linefill
In linux kernel since version 2.6.12 )
Adds additional capabilities to the SLIP driver to support the
RELCOM line fill and keepalive monitoring. Ideal on poor quality
analogue lines.