From owner-freebsd-net  Fri Feb 15  8:21:39 2002
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Date: Fri, 15 Feb 2002 08:20:56 -0800 (PST)
From: Vinod Namboodiri <geekvinod@yahoo.com>
Subject: Re: MAC Layer of TCP/IP stack
To: Jason Hunt <leth@primus.ca>
Cc: freebsd-net@freebsd.org, freebsd-mobile@freebsd.org
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Not actually.Its more to run QoS experiments and need
to customize some medium access protocols like csma/ca
e.t.c.Guess i cant get to the csma protocol from the
freebsd tcp/ip stack source code.
Vinod

--- Jason Hunt <leth@primus.ca> wrote:
> If you mean that you would like to change the MAC
> address that the card
> has programmed into it, then yes you can change it,
> but not perminatly.
> The MAC address is hard-coded into the card, and is
> restored on a reboot
> if you change it.  You can configure the machine to
> use a MAC address that
> you specify by using the option I've pasted below.
> 
> This is from the ifconfig(8) man page:
> 
> lladdr addr
>         Set the link-level address on an interface.
> This can be used to
>         e.g. set a new MAC address on an ethernet
> interface, though the
>         mechanism used is not ethernet-specific. The
> address addr is
>         specified as a series of colon-separated hex
> digits.  If the
>         interface is already up when this option is
> used, it will be
>         briefly brought down and then brought back
> up again in order to
>         insure that the receive filter in the
> underlying ethernet hard-
>         ware is properly reprogrammed.
> 
> 
> Hope this helps.
> 
> 
> On Thu, 14 Feb 2002, Vinod Namboodiri wrote:
> 
> > Hi there.I am about to embark on a research
> project
> > wherein some changes need to be made in the MAC
> layer
> > of the TCP/IP stack.We have a wireless testbed
> running
> > on FreeBSD.I had a few doubts.can i make the
> changes
> > from the TCP/IP stack source code of FreeBSD?I
> dont
> > know much about the source code of the stack.or
> would
> > i need to be modifying the firmware of the
> wireless
> > network card which probably has the mac layer
> code?
> >
> > Could use some help.
> > Vinod
> >
> >
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> 


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