Date: Sun, 6 Sep 1998 12:10:48 +0200 (CEST) From: Hinrich Eilts <eilts@tor.muc.de> To: freebsd-questions@FreeBSD.ORG Subject: Re: bpfilter Message-ID: <199809061010.MAA25421@tor.muc.de>
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Hello, for BPF you want in kernel-config a line like pseudo-device bpfilter 4 and in /dev entries bpf0 bpf1 ... (as much as the number (4) you selected in kernel-config). Now, as root, a process may bind a bpf with e.g. an ethernet device and read all ethernet packets, regardless of frame format and source. This may be (ab)used for catching passwords send my clear text etc. Hinrich > In the FreeBSD handbook, there's a paragraph that talks about the bpfilter > and how it can be a security risk to your network. What are the security > risks of running bpfilter, and how should I set it up? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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