Modbus
Cellular
Gateway
Index
skipping
is
used
to
reserve
slots
for
new
function
insertion,
when
required.
91
The
diagram
above
depicts
the
IPv6
addressing
through
PPPoE,
PPPoEv6
server
(DSLAM)
on
the
ISP
side
provides
IPv6
configuration
upon
receiving
PPPoEv6
client
request.
When
PPPoEv6
server
gets
client
request
and
successfully
authenticates
it,
the
server
sends
IP
address,
DNS
server
addresses
and
other
required
parameters
to
automatically
configure
the
client.
6to4
6to4
is
one
mechanism
to
establish
automatic
IPv6
in
IPv4
tunnels
and
to
enable
complete
IPv6
sites
communication.
The
only
thing
a
6to4
user
needs
is
a
global
IPv4
address.
6to4
may
be
used
by
an
individual
host,
or
by
a
local
IPv6
network.
When
used
by
a
host,
it
must
have
a
global
IPv4
address
connected,
and
the
host
is
responsible
for
encapsulation
of
outgoing
IPv6
packets
and
decapsulation
of
incoming
6to4
packets.
If
the
host
is
configured
to
forward
packets
for
other
clients,
often
a
local
network,
it
is
then
a
router.
In
above
diagram,
the
6to4
means
no
need
to
set
gateway
address
"automatic"
tunneling
solution.
The
automatic
mean
have
relay
server,
as
defined
in
RFC
3068
has
included
segments
draw
192.88.99.0/24
used
as
6to4
relay
of
anycast
address
to
complete
6in4
setting.
6in4
6in4
is
an
Internet
transition
mechanism
for
Internet
IPv4
to
IPv6
migration.
6in4
uses
tunneling
to
encapsulate
IPv6
traffic
over
explicitly
‐
configured
IPv4
links.
As
defined
in
RFC
4213,
the
6in4
traffic
is
sent
over
the
IPv4
Internet
inside
IPv4
packets
whose
IP
headers
have
the
IP
protocol
number
set
to
41.
This
protocol
number
is
specifically
designated
for
IPv6
encapsulation.
