From owner-freebsd-questions@freebsd.org Tue Apr 21 13:16:41 2020 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 B8A882CD509 for ; Tue, 21 Apr 2020 13:16:41 +0000 (UTC) (envelope-from tundra@tundraware.com) Received: from oceanview.tundraware.com (oceanview.tundraware.com [45.55.60.57]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mailman.tundraware.com", Issuer "mailman.tundraware.com" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4963xN4k8jz4JSR for ; Tue, 21 Apr 2020 13:16:40 +0000 (UTC) (envelope-from tundra@tundraware.com) Received: from [192.168.0.2] (ozzie.tundraware.com [75.145.138.73]) (authenticated bits=0) by oceanview.tundraware.com (8.15.2/8.15.2) with ESMTPSA id 03LDFKY9052359 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NO) for ; Tue, 21 Apr 2020 08:15:20 -0500 (CDT) (envelope-from tundra@tundraware.com) Subject: Re: More On FreeBSD Network Speed (Was: Changes To nat-ing Behaviour?) From: Tim Daneliuk To: FreeBSD Mailing List References: Message-ID: <8fb087fc-4548-ddbd-ba22-684678c58df8@tundraware.com> Date: Tue, 21 Apr 2020 08:15:14 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.6.2 (oceanview.tundraware.com [45.55.60.57]); Tue, 21 Apr 2020 08:15:20 -0500 (CDT) X-TundraWare-MailScanner-Information: Please contact the ISP for more information X-TundraWare-MailScanner-ID: 03LDFKY9052359 X-TundraWare-MailScanner: Found to be clean X-TundraWare-MailScanner-SpamCheck: not spam (whitelisted), SpamAssassin (not cached, timed out) X-TundraWare-MailScanner-From: tundra@tundraware.com X-Spam-Status: No X-Rspamd-Queue-Id: 4963xN4k8jz4JSR X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none; spf=pass (mx1.freebsd.org: domain of tundra@tundraware.com designates 45.55.60.57 as permitted sender) smtp.mailfrom=tundra@tundraware.com X-Spamd-Result: default: False [-1.61 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+a]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; DMARC_NA(0.00)[tundraware.com]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-0.93)[-0.930,0]; IP_SCORE(0.53)[ip: (-1.42), ipnet: 45.55.32.0/19(2.88), asn: 14061(1.24), country: US(-0.05)]; TO_DN_ALL(0.00)[]; NEURAL_HAM_MEDIUM(-0.90)[-0.905,0]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; ASN(0.00)[asn:14061, ipnet:45.55.32.0/19, country:US]; MID_RHS_MATCH_FROM(0.00)[]; SUBJECT_HAS_QUESTION(0.00)[]; RCVD_COUNT_TWO(0.00)[2] 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: Tue, 21 Apr 2020 13:16:41 -0000 On 4/20/20 3:00 PM, Tim Daneliuk wrote: > Linux and FreeBSD have superframe MTUs of 9000 set MacOS MTU is set to 1500. For anyone else that may run into this: For reasons unclear to me, FreeBSD hated that the Linux box was forcing an MTU of 9000, even though FreeBSD had the same thing set. The fix was to tell Linux to use automatic MTU negotiation and all was well. Interestingly, when I did this, Linux decide 1500 was the right size and performance came back. Go figure... -- ---------------------------------------------------------------------------- Tim Daneliuk tundra@tundraware.com PGP Key: http://www.tundraware.com/PGP/