Robustel
GoRugged
R3000
‐
3P
‐
GPS
User
Guide
RT_UG_R3000_v.2.0.3
10.12.2014
80
/
129
Compression
Protocol
Field
Compression
Used
for
PPP
initialization.
In
general,
you
need
to
enable
it
as
default.
Enable
Asyncmap
Value
One
of
the
L2TP
initialization
strings.
In
general,
you
don’t
need
to
modify
this
value.
ffffffff
MRU
Maximum
Receiving
Unit.
It
is
the
identifier
of
the
maximum
size
of
packet,
which
is
possible
to
receive
in
a
given
environment.
1500
MTU
Maximum
Transmission
Unit.
It
is
the
identifier
of
the
maximum
size
of
packet,
which
is
possible
to
transfer
in
a
given
environment.
1436
Link
Detection
Interval
Specify
the
interval
between
L2TP
client
and
server.
To
check
the
connectivity
of
a
tunnel,
the
client
and
server
regularly
send
PPP
Echo
to
each
other.
If
the
client
or
server
receives
no
response
from
the
peer
within
a
specified
period
of
time,
it
retransmits
the
PPP
echo.
If
it
receives
no
response
from
the
peer
after
transmitting
the
PPP
echo
for
max
retries
times,
it
considers
that
the
L2TP
tunnel
is
down
and
tries
tore
‐
establish
a
tunnel
with
the
peer.
30
Link
Detection
Max
Retries
Specify
the
max
retries
times
for
L2TP
link
detection.
5
Expert
Options
You
can
enter
some
other
PPP
initialization
strings
in
this
field.
Each
string
can
be
separated
by
a
space.
noccp
nobsdcomp
