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Billion 800VGT Router
3DES:
Stands
for
Triple
Data
Encryption
Standard,
it
uses
168
(56*3)
bits
as
an
encryption
method.
AES:
Stands
for
Advanced
Encryption
Standards,
you
can
use
128,
192
or
256
bits
as
encryption
method.
Perfect
Forward
Secrecy:
Choose
whether
to
enable
PFS
using
Diffie-Hellman
public-key
cryptography
to
change
encryption
keys
during
the
second
phase
of
VPN
negotiation.
This
function
will
provide
better
security,
but
extends
the
VPN
negotiation
time.
Diffie-Hellman
is
a
public-key
cryptography
protocol
that
allows
two
parties
to
establish
a
shared
secret
over
an
unsecured
communication
channel
(i.e.
over
the
Internet).
There
are
three
modes,
MODP
768-bit,
MODP
1024-bit
and
MODP
1536-bit.
MODP
stands
for
Modular
Exponentiation
Groups.
Pre-shared
Key:
This
is
for
the
Internet
Key
Exchange
(IKE)
protocol,
a
string
from
4
to
128
characters.
Both
sides
should
use
the
same
key.
IKE
is
used
to
establish
a
shared
security
policy
and
authenticated
keys
for
services
(such
as
IPSec)
that
require
a
key.
Before
any
IPSec
traffic
can
be
passed,
each
router
must
be
able
to
verify
the
identity
of
its
peer.
This
can
be
done
by
manually
entering
the
pre-shared
key
into
both
sides
(router
or
hosts).
Select
the
Apply
button
to
apply
your
changes.
Advanced Option
This
function
is
only
available
after
completely
creating
an
IPSec
account.
Click
Advanced
Option
to
change
the
following
settings:
80
Chapter
4:
Configuration