From owner-freebsd-questions@freebsd.org Thu Aug 12 00:20:45 2021 Return-Path: Delivered-To: freebsd-questions@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 C0AC765FE8A for ; Thu, 12 Aug 2021 00:20:45 +0000 (UTC) (envelope-from kudzu@tenebras.com) Received: from mail-lf1-x129.google.com (mail-lf1-x129.google.com [IPv6:2a00:1450:4864:20::129]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 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 4GlS5S6SVBz4mLT for ; Thu, 12 Aug 2021 00:20:44 +0000 (UTC) (envelope-from kudzu@tenebras.com) Received: by mail-lf1-x129.google.com with SMTP id y34so9680172lfa.8 for ; Wed, 11 Aug 2021 17:20:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tenebras-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=wWLuVn6SuGgE4nSnwhfSpaq17s0Fx/+VBLb/8JkRDPY=; b=TgXadHCH+Q4Th+Mjb15knGrBZ1hUo8+njmBlYMIUTlTHgSmM2SaZdKMZBz5CL7u2mz 3cI1isfO82epgR7P5fgGU7aL4keZmqLqjLjJeA6690gDKQmRryOafGiQVfvv+ZqdeCtf cYvaLF/PVnA385SB8jtPonXaR9mnJbHBbqlp84quijsP7UbwdBpQ+v1aglZYYBPo98sH bDRVbmf+PaJaUWfoBAydPXBPHeQPpNqT+nbHPM30f5yEgI3ajlFcTeGmi32juDF8fX+6 Cv9nBc0tr9Xr4xlojG1Ti0h9cLYAwbg/7p69PgM2IHkiVX0oFtV5fwxvl6ic35KOGXu8 CShQ== 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=wWLuVn6SuGgE4nSnwhfSpaq17s0Fx/+VBLb/8JkRDPY=; b=FrsIEO1PdORtVDFvOFHjzovEfQj9kWcn8sntaoOgNd8dYwcNtiOffqaaQQeNTxmMJZ thX5dMZ5wkRlg40pdcUVDPax5h+StT5wTkvQUKGhY9X7RQo2LyYNm+Sf6r9uWghFybQA /GLCdPoBPbxGQ2Au9fyxrRl7dxpSS3HUtQSMAOURKnuvcye2CFRz+smnmj1HGCyFAJHz Z+SFnsCmia2mfWs7djBoWOTZWl1MbkMIjWJw1ICBQBlWKWbN7xxb2H5xdHShyWr/Aksf wwGdWtwRlBwvyQ3pKN9EJTSn4eMtY/FaYEr8nmKJNq6SqDgjei/b1tQxU8dzwH8Yro+3 Sfwg== X-Gm-Message-State: AOAM5327rs49Fp1k9E5nV5UHLFFOHAUvS9lgOt4sYXYhVvCrtAvxj7a1 m4qdPLIWhLjxjw9rBTzeXx8sp9CAv2eQy83pSET7Pw== X-Google-Smtp-Source: ABdhPJz7Dlgqwffl3gAbW9m1G78ramFjTRj01CNN+Q0Qy86ZCRLVZrrtul3M2fG53NXe2AJBItw9/W/FFl1ye3k1HdQ= X-Received: by 2002:a05:6512:1390:: with SMTP id p16mr514855lfa.39.1628727643364; Wed, 11 Aug 2021 17:20:43 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Michael Sierchio Date: Wed, 11 Aug 2021 17:20:07 -0700 Message-ID: Subject: Re: Can ipfw Rules Be Based On DNS Name To: Nathaniel Nigro Cc: "freebsd-questions@freebsd.org" X-Rspamd-Queue-Id: 4GlS5S6SVBz4mLT X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=pass header.d=tenebras-com.20150623.gappssmtp.com header.s=20150623 header.b=TgXadHCH; dmarc=none; spf=none (mx1.freebsd.org: domain of kudzu@tenebras.com has no SPF policy when checking 2a00:1450:4864:20::129) smtp.mailfrom=kudzu@tenebras.com X-Spamd-Result: default: False [0.50 / 15.00]; TO_DN_EQ_ADDR_SOME(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[tenebras-com.20150623.gappssmtp.com:s=20150623]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; NEURAL_SPAM_SHORT(0.80)[0.802]; TAGGED_RCPT(0.00)[]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; DMARC_NA(0.00)[tenebras.com]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DKIM_TRACE(0.00)[tenebras-com.20150623.gappssmtp.com:+]; RCPT_COUNT_TWO(0.00)[2]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::129:from]; R_SPF_NA(0.00)[no SPF record]; FREEMAIL_TO(0.00)[gmail.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; MAILMAN_DEST(0.00)[freebsd-questions] Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.34 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Aug 2021 00:20:45 -0000 On Wed, Aug 11, 2021 at 4:38 PM Nathaniel Nigro wrote: > Ipfw -q add 111 deny udp from (domain) to any(or local ip) (port) in via > No. You can add a rule for a FQDN, but that's only resolved at the time you add the rule. It's just an IP address in the firewall ruleset. You can maintain a table of addresses, and check that with a single rule. You can add and delete CIDR blocks and IPv6 prefixes without changing the ruleset or restarting the firewall. How you might do that is a non-trivial problem. How do you find all the IP addresses associated with a particular domain?