From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.proxmox.com (Postfix) with UTF8SMTPS id 612B869A36 for ; Tue, 23 Mar 2021 13:29:11 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with UTF8SMTP id 58C002EAF7 for ; Tue, 23 Mar 2021 13:29:11 +0100 (CET) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [212.186.127.180]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with UTF8SMTPS id C3D372EAEB for ; Tue, 23 Mar 2021 13:29:09 +0100 (CET) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with UTF8SMTP id 8AF0F463C8; Tue, 23 Mar 2021 13:29:09 +0100 (CET) Message-ID: <8e91028c-36ca-53d3-b6ab-0d1153dda1cc@proxmox.com> Date: Tue, 23 Mar 2021 13:29:08 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:87.0) Gecko/20100101 Thunderbird/87.0 Content-Language: en-US To: martin.konold@konsec.com, Proxmox VE user list References: From: Dominik Csapak In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-SPAM-LEVEL: Spam detection results: 0 AWL 0.180 Adjusted score from AWL reputation of From: address KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment NICE_REPLY_A -0.001 Looks like a legit reply (A) RCVD_IN_DNSWL_MED -2.3 Sender listed at https://www.dnswl.org/, medium trust SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record URIBL_BLOCKED 0.001 ADMINISTRATOR NOTICE: The query to URIBL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#dnsbl-block for more information. [proxmox.com] Subject: Re: [PVE-User] mtu setting for virtual ethernet X-BeenThere: pve-user@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE user list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Mar 2021 12:29:11 -0000 On 3/23/21 13:03, Konold, Martin wrote: > Hi Proxmox Users, > > I learned from the Proxmox forum that appending mtu=1 to the network > definition of a virtual machine instructs the virtual ethernet device to > inherit the mtu from the corresponding bridge. > > In my case > > net0: virtio=FA:FF:FF:FF:FF:D8,bridge=vmbr15,mtu=1 > > and the bridge definition > > iface vmbr15 inet static >         address 10.21.15.11/24 >         bridge-ports enp35s0.4015 >         bridge-stp off >         bridge-fd 0 >         bridge-vlan-aware yes >         bridge-vids 2-4094 >         mtu 1400 > > According to my tests this seams to work indeed. The guest OS shows the > 1400 mtu. > > Question 1: Can the mtu=1 (magic value for auto mtu inheritance) be made > the default? probably not because of backwards compatibility (live-migration etc.) but maybe we could (should?) either add it as default for new vms in the webui, or expose it as a gui field would you mind opening a feature request? https://bugzilla.proxmox.com > > Question 2: It seams that appending mtu=1 breaks the webUI. I get > "Unable to parse network options". thanks for reporting, i sent a patch on the devel list to fix that > > Kind Regards > ppa. Martin Konold > > -- > Martin Konold - Prokurist, CTO > KONSEC GmbH -⁠ make things real > Amtsgericht Stuttgart, HRB 23690 > Geschäftsführer: Andreas Mack > Im Köller 3, 70794 Filderstadt, Germany > > _______________________________________________ > pve-user mailing list > pve-user@lists.proxmox.com > https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-user