Node Discovery in Ad-Hoc Mode. (Sorav Bansal)

[Moustafa A. Youssef]

Hi,
    You can use monitoring mode to listen to packets on all channels. 
This allows you to know the MAC addresses of nodes in your NIC
area. Promiscuous mode can help if you know that all nodes are on the 
same channel. However, you won't be able to get management
packets.
Best,
    Moustafa

>Subject: Re: Node Discovery in Ad-Hoc Mode.
>To: Andronikos Nedos <nedosa at cs.tcd.ie>
>Cc: wireless at lists.samba.org
>From: "Sorav Bansal" <soravban at in.ibm.com>
>Date: Wed, 17 Jul 2002 14:55:25 +0100
>
>
>Hi,
>    As you mention, a broadcast ARP (does such a thing exist for wireless
>LANs ?) should do the trick. However you are probably seeking a solution
>that does not even involve the IP layer... maybe somebody on the list has
>the answer
>cheers,
>sorav
>
>
>
>                                                                                                                                                
>                      Andronikos Nedos                                                                                                          
>                      <nedosa at cs.tcd.ie        To:       Sorav Bansal/India/Contr/IBM at IBMIN                                                     
>                      >                        cc:       wireless at lists.samba.org                                                               
>                                               Subject:  Re: Node Discovery in Ad-Hoc Mode.                                                     
>                      07/17/2002 08:47                                                                                                          
>                      AM                                                                                                                        
>                      Please respond to                                                                                                         
>                      Andronikos Nedos                                                                                                          
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>
>Hi Sorav,
>
>I was hoping to avoid any upper layer discovery procedures. I know
>DSR/AODV can do node discovery, but this useful when you require a
>routing protocol i.e. route/node discovery of nodes that are not your
>immediate neighbors. All I want is to discover an id( nick/MAC) of any
>node that the 802.11 PHY/MAC can sense. There must be a way to do that
>in the MAC layer.
>Any ideas?
>
>/Andronikos
>
>On Wed, 2002-07-17 at 05:47, Sorav Bansal wrote:
>
>>Hi,
>>    One way to do node discovery in ad hoc mode is by using a routing
>>protocol like DSR/AODV in the stack. was this any help ?? :-)
>>regards,
>>sorav
>>
>>
>>
>>
>
>>                      Andronikos Nedos
>>
>
>>                      <nedosa at cs.tcd.ie>         To:
>>
>wireless at lists.samba.org
>
>>                      Sent by:                   cc:
>>
>
>>                      wireless-admin at list        Subject:  Node Discovery
>>
>in Ad-Hoc Mode.
>
>>                      s.samba.org
>>
>
>
>
>>                      07/17/02 02:35 AM
>>
>
>>                      Please respond to
>>
>
>>                      Andronikos Nedos
>>
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>>
>>
>>Hi all,
>>
>>>From an application perspective I would like to be able to discover
>>nodes that are inside my card's coverage area when in Ad-Hoc mode. I am
>>not really sure at what level this is better achieved or even possible.
>>I presume this is MAC layer functionality so the driver should
>>expose an interface perhaps?
>>
>>On the other hand perhaps an ARP request could solve the problem but
>>repeated ARP reqs is a pain when you are in an environment with APs.
>>I guess the question really formulates to how I can acquire the MAC
>>addresses or nicknames of my immediate neighbors, provided of course we
>>communicate on the same channel and have the same ESSID (is that a
>>restriction? would it be a way to identify nodes in Ad-Hoc mode in
>>every channel,ESSID?).
>>
>>I thought that Active scanning might do the job but though the
>>specification defines it for both Managed and Ad-Hoc modes (Section
>>11.1.3.1) is currently implemented for APs only.
>>
>>Just for reference I am using Compaq WL110, Kernel 2.4.18, orinoco 0.9b
>>on Red Hat 7.2.
>>
>>Best Regards,
>>
>>/A
>>
>>Andronikos Nedos
>>Distributed Systems Group
>>Trinity College Dublin
>>Dulbin 2
>>Ireland
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