Subject: Re: kern/28339: M_HASFCS not honored in bpf(4)
To: Thilo Manske <Thilo.Manske@HEH.Uni-Oldenburg.DE>
From: David Young <>
List: netbsd-bugs
Date: 11/17/2004 11:59:13

Thank you for the PR.

I think the proper place to remove the FCS is in the driver, so that
bpf(4) doesn't contain knowledge of the various link-layers (DLT_EN10MB,

Apparently, on many NICs, the FCS is present whenever promiscuous mode
is enabled.  Since most bpf(4) packet capture programs enable promiscuous
mode, they help expose the driver's mistake.


David Young             OJC Technologies      Urbana, IL * (217) 278-3933