Date: Sat, 17 Mar 2007 17:58:45 +1100 From: Mark Andrews <Mark_Andrews@isc.org> To: JoaoBR <joao@matik.com.br>, freebsd-stable@freebsd.org Subject: Re: rc.order wrong (ipfw) Message-ID: <200703170658.l2H6wjTD098761@drugs.dv.isc.org> In-Reply-To: Your message of "Fri, 16 Mar 2007 17:28:16 PDT." <20070317002816.GA40565@icarus.home.lan>
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> On Fri, Mar 16, 2007 at 08:33:01PM -0300, JoaoBR wrote: > > On Friday 16 March 2007 18:50, Jeremy Chadwick wrote: > > > Okay, imagine this order: > > > > > > 1) Kernel starts > > > 2) Network driver is loaded > > > 3) Link is brought up > > > 4) Interface is configured for IP (manually or via DHCP) > > > 5) Firewall rules (ipfw or pf) are applied > > > > > > Do you realise that between steps #4 and steps #5 there is a small > > > window of time where someone may be able to send packets to your machine > > > and get responses which would normally be blocked by ipfw/pf? > > > > nono that is not exactly how it works > > > > unless you change ipfw's default behaviour which is deny all from any to an > y, > > nothing goes to this machine because by default everything is blocked until > > > you permit it > > You're absolutely correct, however your original post seems to have > taken many of us by surprise, causing some of us (at least me!) to > assume that you've changed the default method to allow. I'm obviously > misunderstanding, so I apologise for that, but I hope you can see the > reasoning behind my comments with what I knew at the time. :) ipfw needs to be before networking or router discovery fails for IPv6. http://www.freebsd.org/cgi/query-pr.cgi?pr=conf/108589 > -- > | Jeremy Chadwick jdc at parodius.com | > | Parodius Networking http://www.parodius.com/ | > | UNIX Systems Administrator Mountain View, CA, USA | > | Making life hard for others since 1977. PGP: 4BD6C0CB | > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews@isc.org
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