Date: Wed, 12 Dec 2007 12:01:14 +0000 From: Alex Zbyslaw <xfb52@dial.pipex.com> To: Nikos Vassiliadis <nvass@teledomenet.gr>, freebsd-questions@freebsd.org Subject: Re: performance impact of large /etc/hosts files Message-ID: <475FCD8A.5090903@dial.pipex.com> In-Reply-To: <200712120920.46626.nvass@teledomenet.gr> References: <475E0190.7030909@pacific.net.sg> <475EC215.8060004@dial.pipex.com> <475F4209.8080507@pacific.net.sg> <200712120920.46626.nvass@teledomenet.gr>
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Nikos Vassiliadis wrote: >On Wednesday 12 December 2007 04:06:01 Erich Dollansky wrote: > > >>>There's no clean solutions to getting different lookups per-user that >>>I >>> >>> >>The clen solution is hosts. >> >> > >But hosts is operating system-wide. > >Both ipfw and pf support tables, which is what you >want, large sets or unrelated (addresses|networks). >Both of them support UID matching as a target >(caution: this feature is not mpsafe on FreeBSD-6). > > I don't understand how you think any firewall would do this. Firewalls will block based on IP addresses, whereas what I do (pointing numerous ad sites at a local apache vhost) works based on names. I have no clue if the ad sites share IP addresses with anything else, nor do I care; nor do I care if some ad site has 50 different IP addresses because I never resolve the real IP. To take a random, made up example: ads.useful.site = 10.1.1.1 www.useful.site = 10.1.1.1 Using hosts (or DNS) I can make ads.useful.site instead = 192.168.1.1 or ads.useful.site = 101.1.1 -> 10.1.1.255 but I'm going to spend *forever* before I get all those IP addresses from a round-robin DNS entry to put into some ipfw table, and if any of those addresses also hosts the main site, I end up blocking that too. I don't see how a firewall is appropriate for this (hosts.allow, likewise). The point of the exercise is to never even contact the ad host. If I've misunderstood something about your approach, please enlighten me. --Alex
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