From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 30E1CC4742C for ; Mon, 16 Nov 2020 12:18:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A3FAE2224B for ; Mon, 16 Nov 2020 12:18:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=elloe.vision header.i=@elloe.vision header.b="X1pg5hMX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729516AbgKPKpW (ORCPT ); Mon, 16 Nov 2020 05:45:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37908 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729478AbgKPKpV (ORCPT ); Mon, 16 Nov 2020 05:45:21 -0500 Received: from iam.tj (soggy.cloud [IPv6:2a01:7e00:e000:151::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6B840C0613CF for ; Mon, 16 Nov 2020 02:45:21 -0800 (PST) Received: from [10.0.40.123] (unknown [51.155.44.233]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits)) (No client certificate requested) by iam.tj (Postfix) with ESMTPSA id D1D57340AD; Mon, 16 Nov 2020 10:45:18 +0000 (GMT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=elloe.vision; s=2019; t=1605523520; bh=yGroCdZLhn2HqEMw7T1Oi+tK+hJQmdvMS0jFSZv14dU=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=X1pg5hMX4yxSuL/lV6LgaQaIEKmcUcPZ4AwMOr6zXldCVdtCouKkFqU+MUVSYNAiT 5GBKBxRa55uoXZIB3W3V6AW5b2Ul4UtjeNYvYmjgqKKlMBMs7iafqqciTA2VNAwESz 9buBS3QlcNzqJwuks21dflvJ9q4wxzyhvfK6sQDpBowyVyc+bzKWJM7cc3I81PfnD8 K8QAUSfroc+GnRvJ/TRXHInWcxvEKkloqJ2PjlRZmKj6dUcWbroWyJykatcGziq22r x946yvnM6Z0xAlnkBgpI0IjPd1WiFtf0FbtILPtcom0pLX+wgiOOuH21ZnhxJY6s2D oq8wFH7+GpD0w== Subject: Re: dsa: mv88e6xxx not receiving IPv6 multicast packets To: Andrew Lunn Cc: Vladimir Oltean , netdev@vger.kernel.org, chris.packham@alliedtelesis.co.nz, f.fainelli@gmail.com, marek.behun@nic.cz, vivien.didelot@gmail.com, info References: <1b6ba265-4651-79d2-9b43-f14e7f6ec19b@alliedtelesis.co.nz> <0538958b-44b8-7187-650b-35ce276e9d83@elloe.vision> <3390878f-ca70-7714-3f89-c4455309d917@elloe.vision> <20201114184915.fv5hfoobdgqc7uxq@skbuf> <20201115160244.GD1701029@lunn.ch> <79ad87d1-15e0-7ccc-e1ad-4aab3fdf0d20@elloe.vision> <20201115172705.GF1701029@lunn.ch> From: "Tj (Elloe Linux)" Organization: Elloe CIC Message-ID: Date: Mon, 16 Nov 2020 10:45:18 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201115172705.GF1701029@lunn.ch> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 15/11/2020 17:27, Andrew Lunn wrote: > So check if you have an IGMP querier in the network. If not, try > turning it on in the bridge, > > ip link set br0 type bridge mcast_querier Thankfully it turns out this is totally unrelated to Linux - our TP-Link Jetstream T1600G-PS has some unfortunate default behaviour and a bug. Specifically, we are operating an IPv6-only network and Layer 2 MLD snooping was enabled and set to forward unknown multicast groups and as such the switch should be broadcasting all multicast packets. However, buried in the TP-Link manual there's a note that says: "Note: IGMP Snooping and MLD Snooping share the setting of Unknown Multicast Groups, so you have to enable IGMP Snooping globally on the L2 FEATURES > Multicast > IGMP Snooping > Global Config page at the same time." We hadn't enabled IGMP snooping since we don't use IPv4! Many thanks for the help resolving this and apologies for mis-reporting it.