Re: Long range test

From: Jouni Malinen (
Date: 2002-04-04 07:26:51 UTC

On Wed, Apr 03, 2002 at 02:35:25PM -0800, Kristian Hoffmann wrote:

> When we ran the driver at our tower
> with 4 sectors and amps, there was an excessive amount of duplicate
> packets. When we would ping someone, you'd get the reply along with about
> 8 other duplicates. We tried doing a download test and it would start,
> but die shortly thereafter. The site has about 20-30 stations. Has
> anyone tried anything similar to this and gotten it working?

At least I haven't tested the driver much with stations being far from the AP or at all with that many stations. Station firmware will automatically retry sending frames that do not get acknowledged, but this should not cause duplications since the retries use the same sequence number and receiver should drop duplicates.

Did you ping from another stations associated to the same AP or from wired network? Is the AP configured as the default gateway for the stations (i.e., no bridging needed; just route the packets with normal IP routing) or as a bridge between wired network and the stations? What was the interval between the first reply and the duplicates (i.e., did they came more than second later or more or less immediately)?

I haven't seen duplicate packets with the latest versions of the driver, but I have to admit I haven't tested anything close to your setup. It would be quite useful to be able to duplicate the problems in my test environment so that I could try to locate the cause for them.

Jouni Malinen                                            PGP id EFC895FA

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