Date: Wed, 5 Jan 2005 21:28:35 +0100 (CET) From: Andreas Davour <ante@Update.UU.SE> To: Charles Swiger <cswiger@mac.com> Cc: freebsd-questions@freebsd.org Subject: Re: Is bpf a part of IPFW, or am I confused? Message-ID: <Pine.LNX.4.61.0501052127110.6553@Psilocybe.Update.UU.SE> In-Reply-To: <145FEF80-5F57-11D9-93F7-003065ABFD92@mac.com> References: <Pine.LNX.4.61.0501052107010.6553@Psilocybe.Update.UU.SE> <145FEF80-5F57-11D9-93F7-003065ABFD92@mac.com>
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On Wed, 5 Jan 2005, Charles Swiger wrote: > On Jan 5, 2005, at 3:09 PM, Andreas Davour wrote: >> I have searched the handbook and the manpages and not really understood the >> role of bpf. Is it supposed to be enabled when I use IPFW or is it another >> beast altogether, best left undisturbed? > > The BPF, or Berkeley Packet Filter, is really intended for use by userland > applications which want to perform network analysis and packet filtering. > IPFW and the other firewalls for FreeBSD are written as kernel modules and > thus deal with the network stack directly. > > The current DHCP implementation (ISC's dhcpd and dhclient programs) depends > on BPF to work, so I would be cautious about removing it from your kernel > unless you are sure you won't need it. Then I'd better not remove it from my kernel config, since I use dhcp for my network connection. Thanks for the warning! /andreas -- A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail?
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