From owner-freebsd-questions@FreeBSD.ORG  Wed Oct 31 11:43:01 2012
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Date: Wed, 31 Oct 2012 06:43:00 -0500 (CDT)
From: Robert Bonomi <bonomi@mail.r-bonomi.com>
Message-Id: <201210311143.q9VBh0bW065617@mail.r-bonomi.com>
To: freebsd-questions@freebsd.org
Subject: Re: Access packets directly from NIC
In-Reply-To: <CAKB6gVgePbudXmRVhTRPcSYttw5FsaW=BUWG8T_tPmPQo+3=jA@mail.gmail.com>
Cc: corebug@corebug.net
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> From owner-freebsd-questions@freebsd.org  Wed Oct 31 06:29:57 2012
> From: =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KLRg9GA0L7QstC10YY=?=
>  <corebug@corebug.net>
> Date: Wed, 31 Oct 2012 13:29:05 +0200
> Subject: Re: Access packets directly from NIC
> To: Jack Mc Lauren <jack.mclauren@yahoo.com>
> Cc: FreeBSD Global Users Mailing List <freebsd-questions@freebsd.org>
>
> 2012/10/31 Jack Mc Lauren <jack.mclauren@yahoo.com>:
> > Hello FreeBSD users !
> >
> > How can i access and check packets directly from NIC ?
> >
> > Regards, Jack
>
> I believe that easiest way is using tcpdump. Also you should specify what 
> you mean by 'accessing packets': is it the need to view raw packet data, 
> or what? :)
>

tcpdump is _the_ tool for this for command-line use.

For access from within a program, 'man bpf'.