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Date: Thu, 20 Oct 2005 09:43:56 -0400
From: Chuck Swiger <cswiger@mac.com>
Organization: The Courts of Chaos
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To: Bsderss <snort_sam@yahoo.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: switching from layer 2 to layer 3 in C programming
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Bsderss wrote:
> I m in developing a network application (from layer 2 to 3).
> Can anyone tell me how to switch from layer 2 to layer
> 3 in C programming?

I'm not sure what you mean by this, but a literal answer can be found in:

/usr/include/net/if_arp.h

...and "man 4 arp".

-- 
-Chuck