DHCP Server on an Wireless Bridge

Glenn Satchell Glenn.Satchell at uniq.com.au
Tue Feb 5 10:53:37 UTC 2008

>Date: Tue, 5 Feb 2008 10:46:07 +0000
>To: dhcp-users at isc.org
>From: Simon Hobson <dhcp1 at thehobsons.co.uk>
>Subject: Re: DHCP Server on an Wireless Bridge
>Vincent Arniego wrote:
>>I have implemented a network that is similar to this post
>>and this one
>>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.
>Have you contacted the vendor to see if this "feature" can be turned 
>off and the device made into a real bridge ?
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?


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