>>> On Mon, Aug 11, 2008 at 11:42 PM, YanBo <dreamfly281@xxxxxxxxx> wrote: >>>> 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? >>> >>> 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. >> >> By using 6 addresses mesh header, is it possible to make A can reach C? >> And how B and C know the route info to reach A? > > No need for 6 address, just 4. 6 address are needed when mesh points > are proxying non-mesh capable stations. > But legacy APs don't know anything about 4 (nor 6) address frames. > The "three adddress problem" is caused by the use of *legacy* (e.g. > any unmodified off-the shelf) AP to connect a mesh portal to an > external network. > There is no problem if you use a wired ethernet connection and a > standard 802.3 bridge between the wired and the mesh interface, e.g > > A -- ethernet -- B --- mesh --- C In currently o11s implementation, after bridge a wired and the mesh interface, it seemed o11s can't correctly deal with the packet that forward by 802.3 bridge. so A still can't reach C. BR yanbo -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
