From owner-freebsd-stable  Thu Jan  2 13:26:27 2003
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Date: Thu, 02 Jan 2003 13:26:23 -0800
From: Michael Sierchio <kudzu@tenebras.com>
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To: dmagda@ee.ryerson.ca
Cc: Evren Yurtesen <eyurtese@turkuamk.fi>,
	freebsd-stable@FreeBSD.ORG, wpaul@ctr.columbia.edu
Subject: Re: wi0 and mtu setting
References: <Pine.A41.4.10.10212272124420.79680-100000@bessel.tekniikka.turkuamk.fi> <867kdnfevc.fsf@number6.magda.ca>
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David Magda wrote:
> Evren Yurtesen <eyurtese@turkuamk.fi> writes:
> 
> 
>>I wonder how come wi driver doesnt let me to set mtu higher than 1500
>>even though I know the card supports it?
> 
> 
> Because the maximum size of the data poriton in a frame for 10Mbit
> and 100Mbit Ethernet is 1500.

That makes no sense to me.  802.11 is not ethernet.

And since it's mandatory to use IPSec, SKIP or some other encapsulating
security protocol for wireless (THANKS! IEEE!), these all reduce the
advertised MTU size to upper layers to avoid frags.  It would be nice
if this reduced mtu size were 1500.


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