From owner-freebsd-net@freebsd.org Sun Nov 24 16:45:04 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 92BCA1B3F7B for ; Sun, 24 Nov 2019 16:45:04 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:c2c:26d8::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 47Lbcb5vs8z4CPd for ; Sun, 24 Nov 2019 16:45:03 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (eg.sd.rdtc.ru [IPv6:2a03:3100:c:13:0:0:0:5]) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id xAOGewAm030291 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 24 Nov 2019 16:41:00 GMT (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: vas@sibptus.ru Received: from [10.58.0.4] ([10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id xAOGetQ6087027 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Sun, 24 Nov 2019 23:40:55 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: Several hosts behind a caching resolver To: Victor Sudakov , freebsd-net@freebsd.org References: <20191124123451.GA6593@admin.sibptus.ru> <20191124160241.GA17008@admin.sibptus.ru> From: Eugene Grosbein Message-ID: Date: Sun, 24 Nov 2019 23:40:48 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <20191124160241.GA17008@admin.sibptus.ru> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=3.3 required=5.0 tests=BAYES_00,HELO_MISC_IP, LOCAL_FROM,RDNS_NONE,SPF_PASS,T_DATE_IN_FUTURE_96_Q autolearn=no autolearn_force=no version=3.4.2 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * -0.0 SPF_PASS SPF: sender matches SPF record * 0.0 T_DATE_IN_FUTURE_96_Q Date: is 4 days to 4 months after * Received: date * 2.6 LOCAL_FROM From my domains * 1.9 RDNS_NONE Delivered to internal network by a host with no rDNS * 1.1 HELO_MISC_IP Looking for more Dynamic IP Relays X-Spam-Level: *** X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on eg.sd.rdtc.ru X-Rspamd-Queue-Id: 47Lbcb5vs8z4CPd X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=permerror (mx1.freebsd.org: domain of eugen@grosbein.net uses mechanism not recognized by this client) smtp.mailfrom=eugen@grosbein.net X-Spamd-Result: default: False [-3.78 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[grosbein.net]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; R_SPF_PERMFAIL(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; IP_SCORE(-1.68)[ip: (-4.50), ipnet: 2a01:4f8::/29(-2.32), asn: 24940(-1.59), country: DE(-0.01)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:24940, ipnet:2a01:4f8::/29, country:DE]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[] 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, 24 Nov 2019 16:45:04 -0000 24.11.2019 23:02, Victor Sudakov wrote: > If there are multiple recursive queries for MS domains only, do you think > the operator of Resolver B can tell if there are 10 or 100 MS clients > behind Resolver A? I guess so, because different Windows versions may behave differently (including erratic behaviour) and volume of DNS traffic may give some hints, too. This seems as XY-problem for me :-) What is your X problem?