From owner-freebsd-net@freebsd.org Thu Sep 12 04:07:21 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 2E32BE9900 for ; Thu, 12 Sep 2019 04:07:21 +0000 (UTC) (envelope-from akgupt3@gmail.com) Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) (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 46TQFz5wh9z3HLr for ; Thu, 12 Sep 2019 04:07:19 +0000 (UTC) (envelope-from akgupt3@gmail.com) Received: by mail-wr1-x42f.google.com with SMTP id u16so26840550wrr.0 for ; Wed, 11 Sep 2019 21:07:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=kqYzwpCtDdDF/kpp8HZ0aI/sNuaCfuPbvBfpGkCSeZI=; b=lWqGOrnVyLvSIThGHm8UKS9+5qPuV0uaTtUviLwH1YbuDG4yewQ4i8Ip6TDRjLpo6I PrIPkUKLduRoADy9aPxyQmz5ZD4tlUIo2zbF+Hf32D5rr6RrULgtvLBNyl1c3VKnVhN2 mzt77M4jCu4mfCpq/HbZ7IMi0Xfm3CSdKHWe5+2s8RWWQhjljpAlfeu+hhpxlifdTgEX nkerxdDMzNaPfZCiW4IR9c+RRKz/i89j9nejm2T6Sz0qejRuVpQ6VkilmYDXewff3eSG 8kxT/h01UW+Mk6+1rXtBx49KLsx1illw/m5S3nLuzB6pHTNX4+/DlEyY9Bw44AHZ0zrx 5fAw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=kqYzwpCtDdDF/kpp8HZ0aI/sNuaCfuPbvBfpGkCSeZI=; b=nJhFDPq2WcCQzXkdqm5EI7RXyShlNj0AwbEEuRw4dZO1Ck101fGXsVIgDTqPtTu62K q12ZgvHpIAwQdtFm+ME36MyfZ2Y7zfHf4OsVKssYKtBez8XJMbEAWClmsF5YTraB9TIn FyNfxq6NghXvwEtGyPKbAgQ/2Werz4EY8p0ceaTpFzcHN8PRQD2XRD/R/5Opqg7VoihL fYQ0ophyg6oUI/WJpR+Om+1eCObZWQXcYhFd9Rf0jN99zE/g9+gqFfUsNrQro7CokuHZ kN5C3rwoY6OZnpl30LvYnOTruzr9ohpgFNO4+alQbzHcM9zt4g3bwhqzQZA1OUw3iWF5 p2QA== X-Gm-Message-State: APjAAAXecYfMvv79yeBw1th4mjOuOL5tixUIw+A7RXosdNnMiKx0OYB7 4NEen3wrtCvFydQfkabPrTgXWLAjvAEJdAr/vq72gDL10CE= X-Google-Smtp-Source: APXvYqxMALEmHsfkRgkKIclTDpJkMd6O/wUNg7ikG1KTFyvH3XUlQuxrLfTopMa0nXpSOlofq4xfSX7ATGQv4hZvpHY= X-Received: by 2002:a5d:560f:: with SMTP id l15mr33373859wrv.64.1568261237723; Wed, 11 Sep 2019 21:07:17 -0700 (PDT) MIME-Version: 1.0 From: Anish Date: Wed, 11 Sep 2019 21:07:06 -0700 Message-ID: Subject: Link flap for setting ether/MAC address To: freebsd-net@freebsd.org X-Rspamd-Queue-Id: 46TQFz5wh9z3HLr X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=lWqGOrnV; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of akgupt3@gmail.com designates 2a00:1450:4864:20::42f as permitted sender) smtp.mailfrom=akgupt3@gmail.com X-Spamd-Result: default: False [-3.00 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36:c]; FREEMAIL_FROM(0.00)[gmail.com]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-net@freebsd.org]; TO_DN_NONE(0.00)[]; IP_SCORE_FREEMAIL(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; IP_SCORE(0.00)[ip: (-9.28), ipnet: 2a00:1450::/32(-2.96), asn: 15169(-2.25), country: US(-0.05)]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[f.2.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0] Content-Type: text/plain; charset="UTF-8" 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: Thu, 12 Sep 2019 04:07:21 -0000 Hi all, Got a very basic question, why physical link is flapped when we set the address # dmesg -c # ifconfig ix1 ether 70:6d:15:1f:12:72 ..wait.. # dmesg ix1: link state changed to DOWN ix1: link state changed to UP # is this a bug or expected behavior? We could update our MAC in next ARP request without link flap or some other system like switch etc expect the link flap to update ARP. Is this the behavior for other systems? Thanks in advance. -Anish