Date: Mon, 15 Apr 2013 13:54:48 +0300 From: Kimmo Paasiala <kpaasial@gmail.com> To: lev@freebsd.org Cc: Mark Martinec <Mark.Martinec+freebsd@ijs.si>, freebsd-net@freebsd.org, current@freebsd.org Subject: Re: ipfilter(4) needs maintainer Message-ID: <CA%2B7WWSeBEhmeAynU6mCEJdPEmcReQ1HCMQaVh=WmBdM9orqqcw@mail.gmail.com> In-Reply-To: <66408799.20130415145023@serebryakov.spb.ru> References: <20130411201805.GD76816@FreeBSD.org> <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>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Apr 15, 2013 at 1:50 PM, Lev Serebryakov <lev@freebsd.org> wrote: > Hello, Kimmo. > You wrote 15 =D0=B0=D0=BF=D1=80=D0=B5=D0=BB=D1=8F 2013 =D0=B3., 14:47:24: > > 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). > Mmm, are you thinking of the way Linux iptables handles this scenario with a kernel mode helper? I don't think any of the three packet filters in FreeBSD has a functionality like that yet. -Kimmo
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CA%2B7WWSeBEhmeAynU6mCEJdPEmcReQ1HCMQaVh=WmBdM9orqqcw>