From owner-freebsd-net@freebsd.org Sun Dec 1 14:38:55 2019 Return-Path: Delivered-To: freebsd-net@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id E3B321AD91C for ; Sun, 1 Dec 2019 14:38:55 +0000 (UTC) (envelope-from vas@sibptus.ru) Received: from admin.sibptus.ru (admin.sibptus.ru [IPv6:2001:19f0:5001:21dc::10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 47QrTq2Dk2z3P2Q for ; Sun, 1 Dec 2019 14:38:55 +0000 (UTC) (envelope-from vas@sibptus.ru) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sibptus.ru; s=20181118; h=In-Reply-To:Message-ID:Subject:To:From:Date; bh=GYiA3JeO+MRPB/eGurMq3mQ2xDH2yppCUn151ea9bow=; b=NF+Y+DwLG0T7LrGRWsj+DEUZ2I InKCEs5kskXd71iEc1gIa+4qr+tuJJbPlBHCWNrtdif9g36KJfo9yPtoPP9stN9oCGZdTjxJgOzln ORQC4a2QuaZGd6zGkQHsfQAyO2ikokX+PbZCPT4pyKXCUgBymZX0X/v3jIdamnX4wEfU=; Received: from vas by admin.sibptus.ru with local (Exim 4.92.3 (FreeBSD)) (envelope-from ) id 1ibQNC-000ItC-0e for freebsd-net@freebsd.org; Sun, 01 Dec 2019 21:38:54 +0700 Date: Sun, 1 Dec 2019 21:38:54 +0700 From: Victor Sudakov To: freebsd-net@freebsd.org Subject: Re: pf, stateful filter and DMZ Message-ID: <20191201143854.GB71897@admin.sibptus.ru> References: <20191121151041.GA93735@admin.sibptus.ru> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="JP+T4n/bALQSJXh8" Content-Disposition: inline In-Reply-To: <20191121151041.GA93735@admin.sibptus.ru> X-PGP-Key: http://admin.sibptus.ru/~vas/ X-PGP-Fingerprint: 10E3 1171 1273 E007 C2E9 3532 0DA4 F259 9B5E C634 User-Agent: Mutt/1.12.2 (2019-09-21) X-Rspamd-Queue-Id: 47QrTq2Dk2z3P2Q X-Spamd-Bar: -------- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=sibptus.ru header.s=20181118 header.b=NF+Y+DwL; dmarc=pass (policy=none) header.from=sibptus.ru; spf=pass (mx1.freebsd.org: domain of vas@sibptus.ru designates 2001:19f0:5001:21dc::10 as permitted sender) smtp.mailfrom=vas@sibptus.ru X-Spamd-Result: default: False [-8.43 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[sibptus.ru:s=20181118]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+mx:c]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.20)[multipart/signed,text/plain]; TO_DN_NONE(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; RCPT_COUNT_ONE(0.00)[1]; IP_SCORE(-3.33)[ip: (-9.86), ipnet: 2001:19f0:5000::/38(-4.93), asn: 20473(-1.82), country: US(-0.05)]; DKIM_TRACE(0.00)[sibptus.ru:+]; DMARC_POLICY_ALLOW(-0.50)[sibptus.ru,none]; SIGNED_PGP(-2.00)[]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:20473, ipnet:2001:19f0:5000::/38, country:US]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 Dec 2019 14:38:56 -0000 --JP+T4n/bALQSJXh8 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable There is still one thing I cannot understand about pf's notion of state.=20 Consider this very simple example: =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D # DMZ 172.16.1.0/24 pass in on $dmz #block in on $dmz from any to 192.168.0.0/16 # Inside 192.168.10.0/24 pass in on $inside =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D While the "block ..." line is commented out, I can "telnet 172.16.1.10 80" = =66rom 192.168.10.3. But when I uncomment the "block ..." line and restart pf, I cannot do that any more. Why is that? My idea was that the "pass in on $inside" creates state so that return traffic from 172.16.1.10:80 to 192.168.10.3:52447 should be permitted, but = this is not happening. Why? --=20 Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/ --JP+T4n/bALQSJXh8 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEcBAEBAgAGBQJd49B9AAoJEA2k8lmbXsY09xIIALfflyuAVTSM+v5j9Rs7xv7p zLgHB1KNvTFvhmJ6tF9BgaTGjZGxJdRk0ttkGsg4Rr3Q+LM0VEHAhZlkZmUuHLvw Apz4jbMRC7nH3o1xTDrAY5yAqf+acovnVUJM1qUkh++AnDu0yAtHIh9AFpn10InI G0MJisRG+s/RE4N+yA84JW4ke60tAoQfRLHPl9iwCw/ErTPPn5L+Toc+XJnnnWME Vc8YvF7Tz9Gb+ZkzfEaSBKu9cVseBf1cJ+BAZPdX3mjl6RuTcosIv5SSHeX7t1Uw BfFs9yjxd9b1ZtJvogO/R3HwE5KWfnl2DlHevb8Ne0uDgACQQK+yvE9BXsNs8PM= =u8bh -----END PGP SIGNATURE----- --JP+T4n/bALQSJXh8--