Node Discovery in Ad-Hoc Mode.

[Sorav Bansal]

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                                                                                                          
                                                                                                                                                
                                                                                                                                                



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

>

>

>
>
>
> 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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