<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:10pt"><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><br><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;">----- Original Message ----<br>From: Glenn Satchell <Glenn.Satchell@uniq.com.au><br>To: dhcp-users@isc.org<br>Sent: Tuesday, February 5, 2008 6:53:37 PM<br>Subject: Re: DHCP Server on an Wireless Bridge<br><br>
>>I
have
implemented
a
network
that
is
similar
to
this
post<br>>><br>>><<a href="http://marc.info/?l=dhcp-users&m=117197611012164&w=2" target="_blank">http://marc.info/?l=dhcp-users&m=117197611012164&w=2</a>><a href="http://marc.info/?l=dhcp" target="_blank">http://marc.info/?l=dhcp</a><br>-users&m=117197611012164&w=2<br>>>and
this
one<br>>><<a href="http://marc.info/?l=dhcp-hackers&m=118314734327638&w=2" target="_blank">http://marc.info/?l=dhcp-hackers&m=118314734327638&w=2</a>><a href="http://marc.info/?l=dh" target="_blank">http://marc.info/?l=dh</a><br>cp-hackers&m=118314734327638&w=2<br>>><br>>>I
already
posted
on
the
dhcp-hackers
ML
but
I
thought
of
posting
here
as
well.<br>>><br>>>And
I
read
the
replies,
unfortunately
it's
true
that
it
is
possible.<br>>>The
MAC
of
the
packet
from
the
PC
is
changed
by
the
MAC
of
bridge.<br>>><br>>>I
checked
this
by
ARP
on
the
DHCP
server
side
and
it
changes.<br>>>The
CHADDR
field
of
the
dhcp
packet
is
different
from
the
ARP
reply.<br>><br>>Actually,
the
two
messages
you
link
to
are
very
different
-
I
assume <br>>you
are
in
the
same
situation
as
the
second
one.<br>><br>>IMHO,
the
bridge
is
broken
and
needs
fixing.
A
layer
2
bridge
does <br>>not
alter
the
packets
passing
through
it
in
any
way<period>.
You
seem <br>>to
have
some
sort
of
'bastardised'
device
that
is
neither
a
bridge <br>>nor
a
router
-
and
it
should
not
be
described
by
the
vendor
as
being <br>>a
bridge.<br><br>[va] This is the equipment, it can be a bridge or an access point.<br><span><a target="_blank" href="http://motorola.canopywireless.com/products/advantage/">http://motorola.canopywireless.com/products/advantage/</a></span><br><br>><br>>Have
you
contacted
the
vendor
to
see
if
this
"feature"
can
be
turned <br>>off
and
the
device
made
into
a
real
bridge
?<br><br>[va] Actually, we asked the vendor to make this as it is a translated bridge.<br>We are currently serving around 300K subs as of today, and not making it translated will be <br>an inventory nightmare. Somehow by translating the layer 2 mac of the device, we are able to determine which antennas are still active. Oh yeah, why not use the uniqueness of the PC mac? Because its not unique.<br>There are NIC's that somehow have the same MAC. And that's the same reason, why I would like to use the bridge's MAC as DHCP lease basis.<br>><br>Can
you
put
a
relay
device
behind
the
bridge
and
use
that
to
forward<br>the
dhcp
requests?
For
example,
using
a
router
or
a
computer
running<br>dhcrelay?
Can
the
"bridge"
function
as
a
dhcp
relay?
Can
you
tell
us<br>what
vendor/model
the
"bridge"
is?<br><br>[va] Motorola Canopy, option 82 is not yet built in, but we might ask them to include it.<br><br><br>regards,<br>-glenn<br><br></div><br></div></div><br>
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