3
Addressing
62
ARP publish
The
SEG
supports
publishing
IP
addresses
on
a
particular
interface.
This
can
optionally
be
done
along
with
a
specific
MAC
address
instead
of
the
actual
interface
MAC
address.
The
SEG
will
then
send
out
these
as
ARP
replies
for
any
ARP
requests
received
on
the
interface
related
to
the
published
IP
addresses.
This
can
done
for
a
number
of
reasons:
•
To
give
the
impression
that
an
interface
in
the
SEG
has
more
than
one
IP
address.
This
is
useful
if
there
are
several
separate
IP
spans
on
a
single
LAN.
The
hosts
on
each
IP
span
may
then
use
a
gateway
in
their
own
span
when
these
gateway
addresses
are
published
on
the
corresponding
SEG
interface.
•
To
publish
multiple
addresses
on
an
external
interface,
enabling
the
SEG
to
use
Static
Address
Translation
(SAT)
for
traffic
to
these
addresses
and
send
it
onwards
to
internal
servers
with
private
IPv4
addresses.
•
A
less
common
purpose
is
to
aid
nearby
network
equipment
responding
to
ARP
in
an
incorrect
manner.
Example: Publishing an ARP entry
This
example
will
create
an
ARPEntry
that
publishes
the
IPv4
address
192.168.10.1
on
the
sfp1
interface:
As
in
the
previous
example,
change
the
context
to
be
ARPEntries
:
Device:/>
cc
ARPEntries
Next,
add
an
ARPEntry
object
to
ARPEntries
:
Device:/ARPEntries>
add
ARP
Interface=sfp1
IP=192.168.10.1
Mode=Publish
Finally,
return
to
the
default
root
context:
Device:/ARPEntries>
cc
Device:/>
