From owner-freebsd-questions@freebsd.org Fri Dec 28 15:16:14 2018 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 07C8F143B7B3 for ; Fri, 28 Dec 2018 15:16:14 +0000 (UTC) (envelope-from byrnejb@harte-lyne.ca) Received: from mx32.harte-lyne.ca (mx32.harte-lyne.ca [216.185.71.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mx32.harte-lyne.ca", Issuer "CA_HLL_ISSUER_2016" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 5F5B98E709 for ; Fri, 28 Dec 2018 15:16:03 +0000 (UTC) (envelope-from byrnejb@harte-lyne.ca) Received: from mx32.harte-lyne.ca (unknown [127.0.32.1]) by mx32.harte-lyne.ca (Postfix) with ESMTP id 7F258189E7 for ; Fri, 28 Dec 2018 10:15:56 -0500 (EST) X-Virus-Scanned: amavisd-new at harte-lyne.ca Received: from mx32.harte-lyne.ca ([127.0.32.1]) by mx32.harte-lyne.ca (mx32.harte-lyne.ca [127.0.32.1]) (amavisd-new, port 10024) with ESMTP id Ml4e2d3thCTS for ; Fri, 28 Dec 2018 10:15:54 -0500 (EST) Received: from webmail.harte-lyne.ca (mx32.harte-lyne.ca [216.185.71.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx32.harte-lyne.ca (Postfix) with ESMTPSA id 60607189DC for ; Fri, 28 Dec 2018 10:15:54 -0500 (EST) Received: from 216.185.71.44 (SquirrelMail authenticated user byrnejb_hll) by webmail.harte-lyne.ca with HTTP; Fri, 28 Dec 2018 10:15:54 -0500 Message-ID: <961dc39c14de8d519801ca9fe3b2cdd9.squirrel@webmail.harte-lyne.ca> Date: Fri, 28 Dec 2018 10:15:54 -0500 Subject: /etc/resolv.conf overwritten by what? From: "James B. Byrne" To: freebsd-questions@freebsd.org Reply-To: byrnejb@harte-lyne.ca User-Agent: SquirrelMail/1.4.23 [SVN] MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-Rspamd-Queue-Id: 5F5B98E709 X-Spamd-Bar: ------- X-Spamd-Result: default: False [-7.49 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; HAS_REPLYTO(0.00)[byrnejb@harte-lyne.ca]; RBL_COMPOSITE_RCVD_IN_DNSWL_MED_DWL_DNSWL_LOW(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:216.185.71.0/26]; TO_DN_NONE(0.00)[]; RCVD_DKIM_ARC_DNSWL_MED(-0.50)[]; REPLYTO_ADDR_EQ_FROM(0.00)[]; DKIM_TRACE(0.00)[harte-lyne.ca:+]; RCVD_IN_DNSWL_MED(-0.20)[32.71.185.216.list.dnswl.org : 127.0.4.2]; HAS_X_PRIO_THREE(0.00)[3]; MX_GOOD(-0.01)[mx32.harte-lyne.ca,mx31.harte-lyne.ca,mx132.harte-lyne.ca]; DMARC_POLICY_ALLOW(-0.50)[harte-lyne.ca,quarantine]; NEURAL_HAM_SHORT(-0.99)[-0.995,0]; FROM_EQ_ENVFROM(0.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:12021, ipnet:216.185.64.0/20, country:CA]; RCVD_TLS_LAST(0.00)[]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[harte-lyne.ca:s=dkim_hll]; RCVD_COUNT_FIVE(0.00)[5]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; DWL_DNSWL_LOW(0.00)[harte-lyne.ca.dwl.dnswl.org : 127.0.4.1]; IP_SCORE(-3.78)[ip: (-9.91), ipnet: 216.185.64.0/20(-4.95), asn: 12021(-3.96), country: CA(-0.09)] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Dec 2018 15:16:14 -0000 At 09:12EST this morning: ls -l resolv* -rw-r--r-- 1 root wheel 46 Dec 28 09:12 resolv.conf_empty_problem Something changed the contents of /etc/resolv.conf from this: search hamilton.harte-lyne.ca harte-lyne.ca # nameserver ::216:33 # nameserver ::216:34 # nameserver 127.0.0.1 nameserver 216.185.71.33 nameserver 216.185.71.34 options edns0 timeout:5 attempts:3 to this: # Generated by resolvconf search localdomain Now /sbin/resolvconf says that it has not been accessed recently: # ls -lu /sbin/resolvconf -r-xr-xr-x 1 root wheel 21803 Apr 3 2018 /sbin/resolvconf And this change was immediately noticed at ~19:13EST by people accessing that host when all of their dns queries stopped resolving. So, I am reasonably certain that whatever overwrote the existing file did so at 09:12 as shown on the mtime-stamp. There are no crontab entries for root on this system: # crontab -l crontab: no crontab for root I have never encountered this problem before. Has anyone any idea of why this happened? -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by e-Mail James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3