Date: Thu, 31 Jul 2008 22:44:27 +0200 From: "=?ISO-8859-1?Q?Ermal_Lu=E7i?=" <ermal.luci@gmail.com> To: mtm@wubethiopia.com Cc: freebsd-net@freebsd.org Subject: Re: Application layer classifier for ipfw Message-ID: <9a542da30807311344u34422adauade5c2b62b71804a@mail.gmail.com> In-Reply-To: <OFD29E8196.3986AFDB-ONC1257497.003DFC81-C1257497.003E0301@raiffeisen.al> References: <OFD29E8196.3986AFDB-ONC1257497.003DFC81-C1257497.003E0301@raiffeisen.al>
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> Hi, > > An Internet Cafe I do some work for was recently having problems with > very slow internet access. It turns out customers were running P2P file > sharing applications which were hogging all the bandwidth. I looked for > programs that would allow me to shape traffic according to the > application layer protocol, but couldn't find any for FreeBSD. I found a > couple: l7-filter and ipp2p, but these are Linux specific. So, I decided > to write one. The result is ipfw-classifyd : > http://people.freebsd.org/~mtm/ipfw-classifyd.tar.bz2 > > As the name implies it uses ipfw(4) to implement a userland daemon that > classifies TCP and UDP packets according to regular expression patterns > for various protocols. It's intended to be used with divert(4) sockets > and dummynet(4) so you can do traffic shaping depending on the > application level protocol. The protocol patterns are from the l7-filter > project. > > Basically, you use ipfw(8) to divert tcp/udp packets to the damon. It > reads its configuration file for a list of protocols and ipfw(8) rules. > Then, when it detects a matching session it re-injects the packet back > at the specified rule number. The tarball has a sample configuration > file and firewall script to get you started. > > While I have not done extensive testing, preliminary tests are > encouraging and it seems to work, so I thought I'd announce it to the > rest of the world in case anyone else is interested in this kind of > application. > > Comments and suggestions highly appreciated. Thanks for this. I have a question, you remove a flow from if you see a FIN for the TCP case and only on overlapping flow for either TCP/UDP how do the other flows expire i am missing that part? > > Cheers. > -- > Mike Makonnen | GPG-KEY: http://people.freebsd.org/~mtm/mtm.asc > mtm @ FreeBSD.Org | AC7B 5672 2D11 F4D0 EBF8 5279 5359 2B82 7CD4 1F55 > FreeBSD | http://www.freebsd.org > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > > -- Ermal
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