On Wed, Mar 6, 2013 at 4:59 PM, MingAnn Ng <[email protected]> wrote:
> Hi Thomas and Yeoh,
>
>
> I have successfully compile compat-driver-3.8-1 and run it on my system. I'm
> having 3 nodes near to each other and the signal strength between them are
> about 45dBm to 65dBm. From a particular node, I continuously ping the other
> two nodes for more than 14hours. Ping result to one of the nodes has no
> duplication and packet loss. Ping result for the other node are: out of
> 50453 packet received, there are 590 duplicated without any packet loss.
It is possible that this will happen if the path selection algorithm
determines a multi-hop path is in fact "better". This bit of code in
net/mac80211/rx.c:
/* Frame has reached destination. Don't forward */
if (!is_multicast_ether_addr(hdr->addr1) &&
ether_addr_equal(sdata->vif.addr, hdr->addr3))
return RX_CONTINUE;
will accept frames as long as the DA matches the local address. Then
the receiving node will get both the original and forwarded frame (if
it is in range, of course). Maybe this is an argument for only
matching against TA? Except IEEE 802.11-2012 9.32.4.2(b) actually
states that this is the right address to check.
So I'm not sure what the right approach in this case is. Live with
duplicate MSDUs? Fix the path selection so if an established peer
matches the destination, that hop is "best"?
--
Thomas
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