Date: Thu, 22 Jan 1998 14:30:00 +1030 From: Greg Lehey <grog@lemis.com> To: Greg Ryan <greg@safetyweb.com.au> Cc: freebsd-isp@FreeBSD.ORG Subject: Re: tcpdump configuration Message-ID: <19980122143000.19338@lemis.com> In-Reply-To: <3.0.5.32.19980122145556.03a1d390@bach>; from Greg Ryan on Thu, Jan 22, 1998 at 02:55:56PM %2B1100 References: <3.0.5.32.19980122145556.03a1d390@bach>
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On Thu, Jan 22, 1998 at 02:55:56PM +1100, Greg Ryan wrote: > Hi All, > > I'm trying to watch the traffic on our network to track down a problem, and > am having trobule configuring tcpdump on either of our freebsd machines. > > I get the error '/dev/bpf0: Device not configured' > > The man pages say that root must have read access to the device but: > > crw------- 1 root wheel 23, 0 Oct 18 22:19 bpf0 > > Have also tried setting exec permission, but no effect. Is there something > i may have missed, or a flag somewhere that (dis)allows promiscuous mode? You need support for BPF in your kernel. It's not there by default in older versions, but it is in newer ones. Add the following line to your kernel config and build a new kernel: pseudo-device bpfilter 16 # Berkeley packet filter Greg
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