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=-7.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 0FA4EC433E0 for ; Mon, 3 Aug 2020 15:38:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D3E152076C for ; Mon, 3 Aug 2020 15:38:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Q9TpiX9S" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726864AbgHCPiR (ORCPT ); Mon, 3 Aug 2020 11:38:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43764 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725945AbgHCPiQ (ORCPT ); Mon, 3 Aug 2020 11:38:16 -0400 Received: from mail-qt1-x82f.google.com (mail-qt1-x82f.google.com [IPv6:2607:f8b0:4864:20::82f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8C6C7C06174A for ; Mon, 3 Aug 2020 08:38:16 -0700 (PDT) Received: by mail-qt1-x82f.google.com with SMTP id s16so28500619qtn.7 for ; Mon, 03 Aug 2020 08:38:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=usSuKDh9W7pyP4uV3ROiWHM3D2Kg18yxfsjU6L+t0vc=; b=Q9TpiX9SKUpmwfxt26DMuL8cg6IoIcsTjPmZTJOVXnuBeLmDlmQsaKCj92++XQVTuP A9dPedP7iZbfMv3Vuu9B6321oE1ns0x5CI/eqUD/3vnb4TnlqKWm3zCMk/ffx/GkttzR 5BSK3ORZ6ux4wbiZLxW3FVPD9eoZsO5no8GWz609dXwGTjdUJ4M59iFZ8EZ3FQds8Btt yqnfsKPc1k1HRw21Mq9SprrIjMUn7F2hNSBMNNcSOD98dwfxO5XbmgH3Jx+yPfiIWp11 ot9yJJvvnWH1LFkvd6RTEjsRXEDAZjFQjXzqow7YYEsaXFDRjinO+aTKq2C6Ub/wGGJd on6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=usSuKDh9W7pyP4uV3ROiWHM3D2Kg18yxfsjU6L+t0vc=; b=XcgLnFce5ADWpN/y8xEs6srrfnIFzBEo4oiy+tu/eI2tBU4fzkBSjlGyj+VJdBnnZN KsauECaxX82ePNjeqbFbgcv0sRr7xBBb5WYMGKh26MTHMWtkmcVHu0AGLRLLXmqVfvtF mXTvvvdBd+Fi1b524WFVA0AcYM8/vUerKEMQddHYqnKS/nGuB8CSp12EcokD0G88CGQ+ 1usjnl/bYIYjY+2FqvPhr/kdhoq8zmH7SoakXwRMS/LZhlN4l7wpYoscjidgFuZ5rArC ERfMu81aG5LW27hiBHVUNiMViKF4SXIg2JM+C3D1XQK+cKA2bBwDkJoa0YKgZ2xZPLOm xnew== X-Gm-Message-State: AOAM531UhydNyqlnlOGCcfYhy2BzuLu64/3mrBoGR+DrWAkRkIRU8WvN bn2U+Rsx6TtpVs0IIapN2444PRkU X-Google-Smtp-Source: ABdhPJyR/r2wJnU8hLTdy2HjM4omPX9DUbTVBOIMRsF8jDCipGRMRUwBCKtIJJ/9EBW0ydbl6aBjqw== X-Received: by 2002:ac8:548b:: with SMTP id h11mr17187208qtq.209.1596469095556; Mon, 03 Aug 2020 08:38:15 -0700 (PDT) Received: from ?IPv6:2601:284:8202:10b0:989f:23de:f9a0:6da? ([2601:284:8202:10b0:989f:23de:f9a0:6da]) by smtp.googlemail.com with ESMTPSA id c33sm22602822qtk.40.2020.08.03.08.38.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 03 Aug 2020 08:38:15 -0700 (PDT) Subject: Re: PMTUD broken inside network namespace with multipath routing To: mastertheknife Cc: netdev@vger.kernel.org References: From: David Ahern Message-ID: <1b4ebdb3-8840-810a-0d5e-74e2cf7693bf@gmail.com> Date: Mon, 3 Aug 2020 09:38:14 -0600 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 8/3/20 8:24 AM, mastertheknife wrote: > Hi David, > > In this case, both paths are in the same layer2 network, there is no > symmetric multi-path routing. > If original message takes path 1, ICMP response will come from path 1 > If original message takes path 2, ICMP response will come from path 2 > Also, It works fine outside of LXC. > > I'll take a look when I get some time; most likely end of the week.