WdsvsAp

Category:Sasecurity
Date:	Fri, 20 Aug 2004 16:18:53 +0100	
To:	"Dimitri Georganas" <dg@mitc.net>	
From:	"Joel Smith" <joel@dalesit.com> Add to Address Book	
CC:	meshapuser@lists.locust.net	
Subject:	Re: [MeshAPuser] Condo Mesh Network	
=====
From:	"Steve Paltzer" <wireless@anvis.com> Add to Address Book	
To:	meshapuser@lists.locust.net	
Date:	Fri, 20 Aug 2004 07:02:44 -0500	
Subject:	Re: [MeshAPuser] Wireless Mesh and WDS (Wireless Distribution System)	
Welcome to the List,
I believe the MeshAP uses AODV to accomplish it meshing.
http://w3.antd.nist.gov/wctg/aodv_kernel/
As a whole, the MeshAP uses sever layers of the OSI networking model to
accomplish its Meshing.
It looks like WDS is just a repeater technology. I do not know what OSI 
layers
it uses.
One link I found on the topic.
http://www.proxim.com/support/techbulletins/TB-046.pdf
I do not think there is any relation between Meshing and WDS.
Of course I could be wrong. I only know little about the inner workings 
of the
MeshAP, and almost nothing about WDS. I feel WDS is impractical, 
compared to
what the MeshAP is able to accomplish.
-Steve
On Fri, 20 Aug 2004 13:45:23 +0900, Yongseok Park wrote
> Hi, maybe it was discussed before, but please pardon me as I am a new
> member.
> 
> I am wondering what the relation is between Wireless Mesh and WDS,
> which many wireless bridges support. Is that just layer 3 vs layer 2,
> or something else?
> 
> Thanks,
> 
> ---
> Yongseok Park (¹Ú¿ë¼®), Ph.D.
> Principal Engineer
> Samsung Electronics, Telecom R&D Center
> Tel: +82-31-279-5180
> E-mail: yongseok.park@samsung.com
Delete Reply Forward Sp
========
WIRELESS DISTRIBUTION SYSTEM WDS
At 8:00 am +0200 20/8/04, Dimitri Georganas wrote:
>How does WDS user on MeshAP compare to WDS used i.e on linksys 
>product? I understood that meshap links two or more meshnodes using 
>wds and runs a vtun between them? Why is ther a limit to the number 
>of nodes you can link together with WDS with off-the-shelf equipment 
>like cisco or linksys, while there is no real limit with MeshAP?
The main difference between MeshAP and ordinary APs using WDS is that 
the MeshAP network is a routed network, rather than a bridged 
network. With a standard AP network linked using WDS, each packet has 
to be retransmitted to every node and back again, before the ethernet 
transaction is finished.
With a MeshAP network, when the packet goes from the client to the 
MeshAP, that transaction is finished at the ethernet layer. The 
packet is then routed on via the next hop, but that is dealt with by 
TCP/IP. It thus scales extremely well, as it doesn't matter as much 
how many hops there are, as the packet has been successfully 
delivered.
With the standard WDS network, it scales extremely poorly, as the 
more nodes on the network, the more time spent transmitting and 
retransmitting each packet.
Cheers,
Joel
-- 
Joel Smith
Dales IT Ltd
Units 68/9 Glasshouses Mill
HarrogateTel: +44 1423 712591Mobile: +44 7768 803758
N.Yorks HG3 5QHFax: +44 870 1617192
=============
Date:	Fri, 20 Aug 2004 17:46:01 +0100	
From:	"Graham" <graham@cambridgematrix.co.uk> Add to Address Book	
To:	"Dimitri Georganas" <dg@mitc.net>	
CC:	meshapuser@lists.locust.net	
Subject:	Re: [MeshAPuser] Wireless Mesh and WDS (Wireless Distribution System)	
Hi All,
AODV is Layer 3 .. not sure about WDS but Id guess its layer 2 ( MAC 
Layer )
Dimitri Georganas wrote:
> Steve Paltzer wrote:
>
>> Welcome to the List,
>>
>> I believe the MeshAP uses AODV to accomplish it meshing.
>> http://w3.antd.nist.gov/wctg/aodv_kernel/
>> 
>>
> Yes it does, but before it can mesh, the radio's must have 
established 
> contact. That's done through wds if the radio's are infrastructure 
mode.
>
>> As a whole, the MeshAP uses sever layers of the OSI networking model 
to
>> accomplish its Meshing.
>> 
>>
> That contradicts your previous statement, unless AODV represents the 
> entire OSI model ;-
>
>> It looks like WDS is just a repeater technology. I do not know what 
>> OSI layers
>> it uses.
>> 
>>
> WDS is a way you can connect two infrastructure nodes together. 
MeshAP 
> uses wds to do that too. Only after there is contact between two 
> radio's AODV messages come trhough and vtund connections are 
> established between nodes.
>> One link I found on the topic.
>> http://www.proxim.com/support/techbulletins/TB-046.pdf
>>
>> I do not think there is any relation between Meshing and WDS.
 
> In infrastructure, WDS is a neccessity to be able to mesh nodes 
> together. You can have wds without meshing, but you can't have 
meshing 
> without WDS, in infrastructure mode. In ad-hoc mode, you can have 
mesh 
> without wds, because ad-hoc nodes don't need wds to talk to 
eachother...
>> Of course I could be wrong. I only know little about the inner 
>> workings of the
>> MeshAP, and almost nothing about WDS. I feel WDS is impractical, 
>> compared to
>> what the MeshAP is able to accomplish.
>>
>> -Steve
>>
>> On Fri, 20 Aug 2004 13:45:23 +0900, Yongseok Park wrote
 
>>
>>> Hi, maybe it was discussed before, but please pardon me as I am a 
new
>>> member.
>>>
>>> I am wondering what the relation is between Wireless Mesh and WDS,
>>> which many wireless bridges support. Is that just layer 3 vs layer 
2,
>>> or something else?
=== links ===
MeshNetworking