10
Advanced Settings
169
Other Idle Lifetime
Specifies
in
seconds
how
long
flows
using
an
unknown
protocol
can
remain
idle
before
they
are
closed.
Device:/>
set
Settings
FlowTimeoutSettings
FlowLifetimeOther=130
Default:
130
Length limit settings
This
section
contains
information
about
the
size
limits
imposed
on
the
protocols
directly
under
IP
level,
such
as
TCP,
UDP,
and
ICMP.
The
values
specified
here
apply
to
the
IP
data
contained
in
packets.
In
the
case
of
Ethernet,
a
single
packet
can
contain
up
to
1,480
bytes
of
IP
data
without
fragmentation.
In
addition
to
that,
there
are
20
bytes
of
IP
header
and
14
bytes
of
Ethernet
header,
which
totals
the
maximum
media
transmission
unit
on
Ethernet
networks
of
1,514
bytes.
Max TCP Length
Specifies
the
maximum
size
of
a
TCP
packet
including
the
header.
This
value
usually
correlates
with
the
amount
of
IP
data
that
can
be
accommodated
in
an
unfragmented
packet,
since
TCP
usually
adapts
the
segments
it
sends
to
fit
the
maximum
packet
size.
However,
this
value
may
need
to
be
increased
by
20–50
bytes
on
some
less
common
VPN
systems.
Device:/>
set
Settings
LengthLimSettings
MaxTCPLen=1480
Default:
1,480
Max UDP Length
Specifies
in
bytes
the
maximum
size
of
a
UDP
packet
including
the
header.
This
value
may
well
need
to
be
quite
high,
since
many
real
‐
time
applications
use
large,
fragmented
UDP
packets.
If
no
such
protocols
are
used,
the
size
limit
imposed
on
UDP
packets
can
probably
be
lowered
to
1,480
bytes.
Device:/>
set
Settings
LengthLimSettings
MAxUDPLen=60000
Default:
60,000
Max ICMP Length
Specifies
in
bytes
the
maximum
size
of
an
ICMP
packet.
ICMP
error
messages
should
never
exceed
600
bytes,
although
Ping
packets
can
be
larger
if
so
requested.
This
value
may
be
lowered
to
1,000
bytes
if
it
is
undesirable
to
use
large
Ping
packets.
Device:/>
set
Settings
LengthLimSettings
MaxICMPLen=10000
Default:
10,000
