From owner-freebsd-net@freebsd.org Wed Jul 17 08:42:31 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 49E92A6B6C for ; Wed, 17 Jul 2019 08:42:31 +0000 (UTC) (envelope-from egypcio@gmail.com) Received: from mail-yw1-xc35.google.com (mail-yw1-xc35.google.com [IPv6:2607:f8b0:4864:20::c35]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 747C36E702 for ; Wed, 17 Jul 2019 08:42:30 +0000 (UTC) (envelope-from egypcio@gmail.com) Received: by mail-yw1-xc35.google.com with SMTP id z63so10263328ywz.9 for ; Wed, 17 Jul 2019 01:42:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=JSrR1MW9tLv2wPhZleUGGwsp8VRyjBH7D7yq4qECEWs=; b=EoyI69PBGZTGqdLz86+DTRLzu/NA21frUJn3JvMSu4X7OKpjt6mdDBUJVSheeO1u5H N9G20ueFhxCXaNDVj7S8PG8YaDTL+b8zSX3w/ANkgnmtzoTq0z34r0mBNCswC6B/Hptf l8q2uAnZMVup779ysJRenGwAfsljgsRMabp/mc4TwRAGj3wYvfZQifr69S+QtjFoOxKg NkScDDyJO3CudpNizPX+FxNttZ0WbptwUq99GVFKYwTYN3een1SVAHOUnOPZTctVNQam nu8GeFMd4hG48+vEMVAsSbnMU/v0A3IlZHIL4ZjeAuEZ1ThAxykA6bzs1Z961ne76uWB UYcg== X-Gm-Message-State: APjAAAX3VeJAVNhHEAvUWTJvqc1N+lo/ccoj+ru5XCQrsRCpq7IxLzHX wLcM8OrcRrBg0gkrTZbFqxId5D71/XCJIugzA0ljY+kj X-Google-Smtp-Source: APXvYqy8wlSzJU+3OierCFkcUKb3AX7mbLyNZlulf97DsUFy0/+mZxhPDoTzqMXIVBLLV6/I5misn0po9rjx4XBBWaw= X-Received: by 2002:a81:4fd4:: with SMTP id d203mr21596260ywb.166.1563352949725; Wed, 17 Jul 2019 01:42:29 -0700 (PDT) MIME-Version: 1.0 References: <8e388abc-f2ac-b070-cf86-a4d3971ac095@rawbw.com> In-Reply-To: <8e388abc-f2ac-b070-cf86-a4d3971ac095@rawbw.com> From: =?UTF-8?Q?Vin=C3=ADcius_Zavam?= Date: Wed, 17 Jul 2019 08:42:18 +0000 Message-ID: Subject: Re: How to set up ipfw(8) NAT between an alias and the main IP address, when the alias is in another network? To: Yuri Cc: "freebsd-net@freebsd.org" X-Rspamd-Queue-Id: 747C36E702 X-Spamd-Bar: -- X-Spamd-Result: default: False [-2.90 / 15.00]; TO_DN_EQ_ADDR_SOME(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; FREEMAIL_FROM(0.00)[googlemail.com]; URI_COUNT_ODD(1.00)[3]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; DKIM_TRACE(0.00)[googlemail.com:+]; RCPT_COUNT_TWO(0.00)[2]; NEURAL_HAM_SHORT(-0.36)[-0.362,0]; DMARC_POLICY_ALLOW(-0.50)[googlemail.com,quarantine]; FORGED_SENDER(0.30)[egypcio@googlemail.com,egypcio@gmail.com]; MIME_TRACE(0.00)[0:+,1:+]; SUBJECT_ENDS_QUESTION(1.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[egypcio@googlemail.com,egypcio@gmail.com]; DWL_DNSWL_NONE(0.00)[googlemail.com.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.99)[-0.993,0]; R_DKIM_ALLOW(-0.20)[googlemail.com:s=20161025]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-net@freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[5.3.c.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; HTTP_TO_IP(1.00)[]; RCVD_TLS_LAST(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; IP_SCORE(-2.83)[ip: (-8.51), ipnet: 2607:f8b0::/32(-3.15), asn: 15169(-2.44), country: US(-0.06)] Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.29 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: Wed, 17 Jul 2019 08:42:31 -0000 Am Sa., 6. Juli 2019 um 08:02 Uhr schrieb Yuri : > My network interface looks like this: > > sk0: flags=3D8843 metric 0 mtu 15= 00 > options=3D80009 > ether 01:3c:47:8a:17:12 > inet 192.168.1.2 netmask 0xffffff00 broadcast 192.168.1.255 > inet 192.168.100.2 netmask 0xffffffff broadcast 192.168.100.2 > media: Ethernet autoselect (100baseTX ) > status: active > nd6 options=3D29 > > The second IP address is an alias that is used for jail. > > I would like to set up NAT so that this jail would access the internet > through the same interface. > > > I tried this script: > > > fw=3D"/sbin/ipfw -q" > > $fw nat 1 config redirect_addr 192.168.100.2 192.168.1.2 redirect_addr > 192.168.1.2 192.168.100.2 if sk0 unreg_only reset > > $fw add 1001 nat 1 tcp from 192.168.100.2/32 to any via sk0 keep-state > > $fw add 1002 check-state > > > The rule 1001 has keep-state, therefore it should process both outgoing > tcp and incoming response packets. But the outbound packets are NATted, > but the inbound ones are not. > > What is wrong, and how to fix this script? > > > Thank you, > > Yuri > jail ... ip4=3Dinherit ? --=20 Vin=C3=ADcius Zavam keybase.io/egypcio