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 ESMTPS id 3B4A27C918 for ; Fri, 5 Nov 2021 14:20:16 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id D9874CFD9 for ; Fri, 5 Nov 2021 14:20:15 +0100 (CET) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [94.136.29.106]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS id DAA9BCFCA for ; Fri, 5 Nov 2021 14:20:14 +0100 (CET) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id B461C45F02; Fri, 5 Nov 2021 14:20:14 +0100 (CET) Message-ID: Date: Fri, 5 Nov 2021 14:20:13 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:95.0) Gecko/20100101 Thunderbird/95.0 Content-Language: en-US To: Proxmox VE development discussion , Alexandre Derumier References: <20211006083220.1145952-1-aderumier@odiso.com> From: Thomas Lamprecht In-Reply-To: <20211006083220.1145952-1-aderumier@odiso.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-SPAM-LEVEL: Spam detection results: 0 AWL 1.209 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment NICE_REPLY_A -2.093 Looks like a legit reply (A) SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record Subject: Re: [pve-devel] [PATCH pve-cluster] sysctl: disable net.ipv4.igmp_link_local_mcast_reports X-BeenThere: pve-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Nov 2021 13:20:16 -0000 On 06.10.21 10:32, Alexandre Derumier wrote: > currently, when veth or tap interfaces are plugged to bridge, > an igmp v3 report is broadcasted to the network, with the > bridge mac adddress. but this disables it for all, couldn't there be repercussions for people relying on multicast? Should it be an FW option? > > Users have reported problems with hetzner for example, blocking the server > because of the unknown mac flooding the network. > https://forum.proxmox.com/threads/proxmox-claiming-mac-address.52601/page-6#post-421676 > > some traces: > > ip addr: > > 190: fwbr109i0: mtu 1500 qdisc noqueue state UP group default qlen 1000 > link/ether 22:5f:0b:cb:ac:42 brd ff:ff:ff:ff:ff:ff > > ebtable log: > Oct 6 09:46:24 kvmformation3 kernel: [437256.753355] MAC-FLOOD-F IN=fwpr109p0 OUT=eno1 MAC source = 22:5f:0b:cb:ac:42 MAC dest = 01:00:5e:00:00:16 proto = 0x0800 IP SRC=0.0.0.0 IP DST=224.0.0.22, IP tos=0xC0, IP proto=2 > > tcpdump -e -i eno1 igmp > 09:53:23.914825 22:5f:0b:cb:ac:42 (oui Unknown) > 01:00:5e:00:00:16 (oui Unknown), ethertype IPv4 (0x0800), length 54: 0.0.0.0 > igmp.mcast.net: igmp v3 report, 1 group record(s) > > Signed-off-by: Alexandre Derumier > --- > debian/sysctl.d/pve.conf | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/debian/sysctl.d/pve.conf b/debian/sysctl.d/pve.conf > index 929698f..85b59b9 100644 > --- a/debian/sysctl.d/pve.conf > +++ b/debian/sysctl.d/pve.conf > @@ -2,4 +2,5 @@ net.bridge.bridge-nf-call-ip6tables = 0 > net.bridge.bridge-nf-call-iptables = 0 > net.bridge.bridge-nf-call-arptables = 0 > net.bridge.bridge-nf-filter-vlan-tagged = 0 > +net.ipv4.igmp_link_local_mcast_reports = 0 > fs.aio-max-nr = 1048576 >