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Date: Thu, 23 Feb 2006 22:39:48 -1000
From: Jim Thompson <jim@netgate.com>
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To: Dmitry Pryanishnikov <dmitry@atlantis.dp.ua>
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Cc: freebsd-current@freebsd.org, Nik <nikruzhan@gmail.com>
Subject: Re: ping (DUP!) in FreeBSD 5.4
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Dmitry Pryanishnikov wrote:

>
> Hello!
>
> On Fri, 24 Feb 2006, Nik wrote:
>
>> This is happen when I setup point to point connection using wireless
>> with
>> realtek network card (rl0). I wondering if this situation will effect my
>
>
>  What kind of wireless hardware do you use? 

he said 'ralink'

> I have seen a lot of duplicates
> with cheap wireless adapters made by Planet or D-Link. It has nothing to
> do with your NIC, duplicates are originated by wireless.

this statement makes no sense.  It translates to "it has nothing to do
with your nice, duplicates are originated by <your nic>".

Yes, you can get dups if the transmitter doesn't receive an ACK.   Any
number of things can cause this.

> Yes, duplicates
> can lower network throughput by using the additional bandwidth. You can
> try to avoid them by changing the antenna orientation.

you can also try:

better coax
dryer coax
installing an antenna period (you'd be suprised at what people try to
get away with)
moving the devices closer together
lowering the modulation rate
etc