5
Routing
90
When
the
Default
Gateway
of
the
second
network's
clients
is
now
set
to
the
same
value
as
the
Local
IP
Address
of
the
above
route,
the
clients
will
be
able
to
communicate
successfully
with
the
interface.
The
IP
address
chosen
in
the
second
network
isn't
significant,
as
long
as
it
is
the
same
value
for
the
Default
Gateway
of
the
clients
and
the
Local
IP
Address
.
The
effect
of
adding
the
route
with
the
Local
IP
Address
is
that
the
SEG
will
act
as
a
gateway
with
the
Local
IP
Address
and
respond
to,
as
well
as
send
out,
ARP
queries
as
though
the
interface
had
that
IP
address.
The
following
diagram
illustrates
a
scenario
where
this
feature
could
be
used.
The
network
10.1.1.0/24
is
bound
to
a
physical
interface
that
has
an
IPv4
address
within
the
network
of
10.1.1.1
.
If
a
second
network
10.2.2.0/24
is
attached
to
the
interface
via
the
switch,
it
is
unbound
since
the
interface's
IP
address
doesn't
belong
to
it.
Figure 6. Using Local IP address with an unbound network
This
feature
is
normally
used
when
an
additional
network
is
to
be
added
to
an
interface,
without
changing
the
existing
IP
addresses
of
the
network.
From
a
security
standpoint,
doing
this
can
present
significant
risks
since
different
networks
will
typically
be
joined
together
through
a
switch,
which
imposes
no
controls
on
traffic
passing
between
those
networks.
Caution
should
therefore
be
exercised
before
using
this
feature.
