DHCP Server on an Wireless Bridge

[Vincent Arniego]

----- Original Message ----
From: Glenn Satchell <Glenn.Satchell at uniq.com.au>
To: dhcp-users at isc.org
Sent: Tuesday, February 5, 2008 6:53:37 PM
Subject: Re: DHCP Server on an Wireless Bridge


>>I 
have 
implemented 
a 
network 
that 
is 
similar 
to 
this 
post
>>
>><http://marc.info/?l=dhcp-users&m=117197611012164&w=2>http://marc.info/?l=dhcp
-users&m=117197611012164&w=2
>>and 
this 
one
>><http://marc.info/?l=dhcp-hackers&m=118314734327638&w=2>http://marc.info/?l=dh
cp-hackers&m=118314734327638&w=2
>>
>>I 
already 
posted 
on 
the 
dhcp-hackers 
ML 
but 
I 
thought 
of 
posting 
here 
as 
well.
>>
>>And 
I 
read 
the 
replies, 
unfortunately 
it's 
true 
that 
it 
is 
possible.
>>The 
MAC 
of 
the 
packet 
from 
the 
PC 
is 
changed 
by 
the 
MAC 
of 
bridge.
>>
>>I 
checked 
this 
by 
ARP 
on 
the 
DHCP 
server 
side 
and 
it 
changes.
>>The 
CHADDR 
field 
of 
the 
dhcp 
packet 
is 
different 
from 
the 
ARP 
reply.
>
>Actually, 
the 
two 
messages 
you 
link 
to 
are 
very 
different 
- 
I 
assume 
>you 
are 
in 
the 
same 
situation 
as 
the 
second 
one.
>
>IMHO, 
the 
bridge 
is 
broken 
and 
needs 
fixing. 
A 
layer 
2 
bridge 
does 
>not 
alter 
the 
packets 
passing 
through 
it 
in 
any 
way<period>. 
You 
seem 
>to 
have 
some 
sort 
of 
'bastardised' 
device 
that 
is 
neither 
a 
bridge 
>nor 
a 
router 
- 
and 
it 
should 
not 
be 
described 
by 
the 
vendor 
as 
being 
>a 
bridge.

[va] This is the equipment, it can be a bridge or an access point.
http://motorola.canopywireless.com/products/advantage/

>
>Have 
you 
contacted 
the 
vendor 
to 
see 
if 
this 
"feature" 
can 
be 
turned 
>off 
and 
the 
device 
made 
into 
a 
real 
bridge 
?

[va] Actually, we asked the vendor to make this as it is a translated bridge.
We are currently serving around 300K subs as of today, and not making it translated will be 
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.
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.
>
Can 
you 
put 
a 
relay 
device 
behind 
the 
bridge 
and 
use 
that 
to 
forward
the 
dhcp 
requests? 
For 
example, 
using 
a 
router 
or 
a 
computer 
running
dhcrelay? 
Can 
the 
"bridge" 
function 
as 
a 
dhcp 
relay? 
Can 
you 
tell 
us
what 
vendor/model 
the 
"bridge" 
is?

[va] Motorola Canopy, option 82 is not yet built in, but we might ask them to include it.


regards,
-glenn







      ____________________________________________________________________________________
Be a better friend, newshound, and 
know-it-all with Yahoo! Mobile.  Try it now.  http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20080205/faadca97/attachment.html>