Data Communication and Host Modes
Rev 3.0B Feb.08
48
1.
When
the
Raven
‐
E
registers
on
the
cellular
network,
it
is
assigned
an
IP
address
from
Alltel,
let’s
say
A.B.C.D.
2.
Acting
as
a
DHCP
server,
in
Public
Mode,
when
the
Raven
‐
E
receives
a
DHCP
request
from
an
Ethernet
device,
it
hands
off
the
assigned
address
to
the
device
and
sets
up
the
default
gateway
address
as
A.B.C.1.
If
the
fourth
octet
is
already
a
1,
it
assigns
A.B.C.2
as
the
router
address.
3.
The
Raven
‐
E
also
sends
a
/24
netmask
(255.255.255.0
by
default)
and
sets
up
a
static
route
which
maps
192.168.13.31
(or
the
address
configured
with
*HOSTPEERIP
if
it
is
changed)
to
A.B.C.1
(or
A.B.C.2
if
that
was
what
the
gateway
address
was
given
as).
Tip: When PPPoE is used with the Raven-E, DHCP is not needed. A
tunnel is set up connecting a device (such as your computer or a
router) with the modem. The device will then simply use the MAC
address of the Raven-E to send all outgoing packets.
Keepalive
Keepalive
is
used
to
test
the
connection
to
the
cellular
network
by
pinging
an
IP
address
after
a
specified
period
of
inactivity.
Keepalive
is
only
recommended
for
users
who
have
a
remote
terminated
modem
that
infrequently
communicates
to
the
network
or
if
you
have
experienced
issues
over
time
where
the
modem
can
no
longer
be
reached
remotely.
When
Keepalive
pings
the
IP
address,
an
acknowledgement
indicates
there
is
an
active
connection
to
the
network.
If
the
Raven
‐
E
does
not
receive
a
response
from
the
IP
address,
it
will
make
additional
attempts
according
to
a
backoff
algorithm
before
determining
the
Internet
connection
is
not
functioning
properly.
If
it
determines
the
connection
is
not
functioning,
the
modem
will
then
attempt
to
reconnect
to
Alltel
to
reestablish
IP
connectivity.
Configuring Keepalive
In
AceManager,
the
Keepalive
settings
are
part
of
the
Other
group.
