#1967: Computing bit error rate and packet loss
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Reporter: anonymous | Owner:
Type: task | Status: new
Priority: major | Milestone:
Component: madwifi: tools | Version: v0.9.4
Resolution: | Keywords:
Patch_attached: 0 |
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Comment (by anonymous):
Replying to [comment:1 [EMAIL PROTECTED]:
> I'm pretty sure BER is not available. Packet loss is easy enough to
reconstruct from higher-layer infomation (e.g. TCP traces.) AFAIK, the
closest you can come to computing BER would be this:
>
> 1. Capture received traffic with a monitor-mode VAP.
> 2. Configure the interface to pass up packets with CRC errors.
> 3. IF you have the original packets, you can try to identify the
specific bytes with errors.
>
> -Eric
Thanks Eric,
The packet loss which i want is at the physical layer.For example if i
want to send 10 packets and i end up transmitting 17,means that 7 packet
were lost.So these 7 are retries.
If i get the total number of retransmissions and total packets sent on the
interface i will be able to get packet loss rate.Hope this makes sense.
I want to know which metrics provided by madwifi help my case.
for example:will short retries+long retries add up to 7 in my example?i m
not really sure.
With rts off,short retries are always zero,and long retries increase with
the increase in distance between the laptops.
With Rts on (threshold 1),surprisingly,with the laptops placed next to
each other i get large values for both short and long retries(between 0
and 250)
--
Ticket URL: <http://madwifi.org/ticket/1967#comment:2>
madwifi.org <http://madwifi.org/>
Multiband Atheros Driver for Wireless Fidelity
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