Date: Thu, 8 Jun 2000 19:42:15 +0300 From: Ruslan Ermilov <ru@sunbay.com> To: John F Cuzzola <vdrifter@ocis.ocis.net> Cc: freebsd-security@FreeBSD.ORG Subject: Re: ipfw & keep-state Message-ID: <20000608194215.A1347@sunbay.com> In-Reply-To: <Pine.LNX.4.21.0006080913220.4117-100000@ocis.ocis.net>; from vdrifter@ocis.ocis.net on Thu, Jun 08, 2000 at 09:17:49AM -0700 References: <Pine.LNX.4.21.0006080913220.4117-100000@ocis.ocis.net>
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On Thu, Jun 08, 2000 at 09:17:49AM -0700, John F Cuzzola wrote: > > Hi all, > I'm interested in using the keep-state/check-state options with ipfw. I'm > curious however what rules are dynamically created and whether I have > control over them, specifically with divert rules. I use divert/natd > heavily and I was wondering what happens with a rule like: > > ipfw divert 7000 ip from any to 200.45.1.7 > ipfw divert 7000 ip from 192.168.3.2 to any keep-state > > (natd would be listening on port 7000 providing static-NAT from 200.45.1.7 > to 192.168.3.2) > If you put `check-state' rule before `keep-state', this will probably be very interesting. There is a common problem with firewalls/NATS. People usually prohibit intranet traffic through external interface, and at the same time use external interface for NAT purposes. The problem is that when IP packet comes back and is dealiased, it is passed to firewall again as "coming in through public interface with intranet destination address", and results in PR conf/13769. I am going to test this right now, and commit the changes to rc.firewall if this seems to work. -- Ruslan Ermilov Oracle Developer/DBA, ru@sunbay.com Sunbay Software AG, ru@FreeBSD.org FreeBSD committer, +380.652.512.251 Simferopol, Ukraine http://www.FreeBSD.org The Power To Serve http://www.oracle.com Enabling The Information Age To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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