From owner-freebsd-net@freebsd.org Thu Aug 25 09:43:14 2016 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 365D7BC5865 for ; Thu, 25 Aug 2016 09:43:14 +0000 (UTC) (envelope-from carl.hattingh@gmail.com) Received: from mail-it0-x22b.google.com (mail-it0-x22b.google.com [IPv6:2607:f8b0:4001:c0b::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 003371BB9 for ; Thu, 25 Aug 2016 09:43:13 +0000 (UTC) (envelope-from carl.hattingh@gmail.com) Received: by mail-it0-x22b.google.com with SMTP id n128so81207587ith.1 for ; Thu, 25 Aug 2016 02:43:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=7CA7I56Y5CRI80cJiDCwBVzQwZzzlWYprQOHgJy+7lw=; b=Db0lfCBsRn7nWdRK9kBUEGwGL5ggoo2IrSUKYy42q7o52D+3/PwFL2/KP6ZgHh1htV oY8+pZxy6f3t3XVCBdt7kSZQsd0wqgiXlWRVg276IznthtrMmmwqwXzAGAkf/F209jvo fiNbcpPO1Dw9VsLvMvmGc+zfOWzjunD09ElSzTRJPS5NS9pFixy/0VNImSvE3Ec2HBgZ Z4eI/+6fh3wMMkX8gbOH5DejT4rk+Uwi9FGrKqIt/qGSkAECqiJI9eAXxgfNHmOSVIqG KImVxc3/b53eaY1qQb3UbuFvN/ViF3sLvkoCi29WeMYRF9TV2ZN1T1xV6ZNZtg2UgiJc CNeQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=7CA7I56Y5CRI80cJiDCwBVzQwZzzlWYprQOHgJy+7lw=; b=b5IsewP49xW+iKE7yG0oCRpDkq0zxOOEubg6uIgF8KBL0bYSYxBawM2+I3q3k6FedE zAzOkz75kfj7ntr+yaErplC+wyy5J641zE7fMgCY5YdvK/PikX0go3USVYmWDQ53jjBB dtFAVhAdG5g7NqJ1UzODw2f3bQibQTMdqANLHU9E6ZvVWWaK7mCCgw96PF1Yon0MqkBP +aLWz320iBWRCNM3ha1f/Mc/SVyFqmZhswDvqZMHzajbH3v4yP//SXbj0fKw14n6SVWD ADdP25qG6cr7dR2N9osDXmy0f93nGANk1AjCh3lThcfNqN/8ERvK4mLdWjIoDaaIck7u vgZA== X-Gm-Message-State: AE9vXwOf4RuRBhba3MfdRfgRKU6BLwhuNtJDCG3yhDKVeeVJcTktDrvII2O/nR85spsWA5dV2HiN+qCNE3/u7Q== X-Received: by 10.107.14.4 with SMTP id 4mr9189918ioo.160.1472118193248; Thu, 25 Aug 2016 02:43:13 -0700 (PDT) MIME-Version: 1.0 Received: by 10.36.37.5 with HTTP; Thu, 25 Aug 2016 02:43:12 -0700 (PDT) In-Reply-To: <58CC8163-E6AD-4657-9E34-0D0EB2135FEC@FreeBSD.org> References: <58CC8163-E6AD-4657-9E34-0D0EB2135FEC@FreeBSD.org> From: Carl Hattingh Date: Thu, 25 Aug 2016 19:43:12 +1000 Message-ID: Subject: Re: Cannot access a couple websites To: freebsd-net@freebsd.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.22 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.22 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, 25 Aug 2016 09:43:14 -0000 On Thu, Aug 25, 2016 at 7:10 PM, Kristof Provost wrote: > On 24 Aug 2016, at 16:02, Carl Hattingh wrote: > >> We are experiencing a issue which has me rather stumped. We are using >> Freebsd 10.3-RELEASE-p7 under Hyper-V 2012 R2 as a firewall (pf), and ar= e >> unable to browse to www.amazon.com and outlook.office365.com under >> certain >> circumstances. >> >> > >> >> Has anyone got any ideas on what this could be? We'd be grateful for an= y >> assistance. >> >> You=E2=80=99re going to have to make a network capture between the gatew= ay and > the NTU device. > Ideally not from the gateway itself (because that might hide checksum > issues). > > Regards, > Kristof > Thanks for the replies. I finally managed to track down the issue, and it was scrub after all. I had "scrub all no-df reassemble tcp" and it was the "reassemble tcp" command that was causing the issue. I have now changed it to "scrub all no-df random-id". I had tested completely commenting out the scrub command earlier to no avail, but clearly wasn't thorough enough in killing states between tests.