Date: Mon, 15 Apr 2013 14:57:06 +0400 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: freebsd-current@freebsd.org Subject: Re: ipfilter(4) needs maintainer Message-ID: <20130415105706.GB21132@zxy.spb.ru> In-Reply-To: <66408799.20130415145023@serebryakov.spb.ru> References: <20130414160648.GD96431@in-addr.com> <36562.1365960622.5652758659450863616@ffe10.ukr.net> <201304150025.07337.Mark.Martinec%2Bfreebsd@ijs.si> <951943801.20130415141536@serebryakov.spb.ru> <CA%2B7WWSeODqdP1_7MDs6=BiGF%2BDSR62w21uu4hS3PtTDBkmshsg@mail.gmail.com> <195468703.20130415143237@serebryakov.spb.ru> <CA%2B7WWSdbEx7Kbc0WOBNLc-vH19DdKK7L-xORO8SepKcMQR2xEg@mail.gmail.com> <621849003.20130415144428@serebryakov.spb.ru> <CA%2B7WWSeXLC6mJXB9zv2p3e1Q-z2Xf3mH9h0SqOmiXWRGLFs4GA@mail.gmail.com> <66408799.20130415145023@serebryakov.spb.ru>
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On Mon, Apr 15, 2013 at 02:50:23PM +0400, Lev Serebryakov wrote: > KP> I'm however talking about an ftp client behind a very restrictive > KP> firewall making an IPv6 connection an ftp server that uses passive > KP> mode data ports that can't be known in advance. > Same solution -- inspection of connections to 21 port, without any > address translation. And if FTP server uses non-standard control > port, yes, here is a problem, but it cannot be solved with NAT too > (or your NAT/firewall should expect each and every connection for FTP > commands, which is heavy and error-prone task). Not heavy. But error-prone, yes.
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