Date: Fri, 30 Nov 2001 22:34:03 +0100 From: Thierry Herbelot <thierry@herbelot.com> To: Ryan Mooney <ryan@pcslink.com> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Capturing packets w/ bad CRC's? Message-ID: <3C07FB4B.E7D10D4E@herbelot.com> References: <20011130110412.D2514@pcslink.com>
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Ryan Mooney wrote: > > Hello, > > I'm trying to write an ethernet level network tester to test a wireless > gigabit product the company I'm working for has developed. I need > to be able to get packets off a Gig-E interface that have bad CRC > checksums so I can see how badly mangled they are. I've tried using > pcap and ng_ether int: lowerboth of which are giving me just the "good" > packets. > > Right now they are being discarded somewhere below the bpf interface. > I'm not sure where, I've read through a bunch of the *if* code, but they are discarded by the Ethernet chipset itself, and this the reason why you don't see any source code for managing bad frames. [SNIP] > > If anyone knows how I can get the bad packets to examine them, I'd much > appreciate it. typically by tweaking the chipset, if at all possible, in order to see also bea frames -- Thierry Herbelot To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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