About MPP & MAP open80211 implementation status

[Javier Cardona]

Hi Yanbo,

On Mon, Aug 11, 2008 at 11:42 PM, YanBo <dreamfly281 at gmail.com> wrote:
> Hi Javier
>
> By reading the 8011s standard draft, it also define the MPP(Mesh
> Portals) and MAP(Mesh Access  Point), I don't know does currently
> open80211s project implement them? I also read a file named
> olpc-mesh.pdf which is write by you, in this file you refer to MPP and
> said  "L2 bridging not possible because of the 3-address problem"
> want ask you guide what's your mean 3-address problem, do you mean all
> currently b&g even n card doesn't support 6 mac address 80211s header?
>  Thanks!

That presentation was for OLPC mesh, which had different requirements
(e.g. work with legacy equipment, single radio) than o11s.  But the
three address problem applies to o11s as well.  It happens when you
try to connect the mesh to an outside network using an normal AP.

A - AP -))    ((-B - C

B, C: are mesh nodes.  B is associated with AP.
Using 3-address 802.11 frames between AP and B, there is no way for A
to reach C.

And no, we have not implemented the 6 address frame format.  This is
not hard to implement, and does not require specific hardware support,
but it is likely to change slightly in future revisions of the 11s
draft.

Cheers,

Javier

-- 
Javier Cardona
cozybit Inc.