From nobody Wed Jun 04 20:26:46 2025 X-Original-To: questions@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4bCJzK3Th5z5xb9y for ; Wed, 04 Jun 2025 20:27:25 +0000 (UTC) (envelope-from kudzu@tenebras.com) Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "WR4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4bCJzJ6tVWz44wt for ; Wed, 04 Jun 2025 20:27:24 +0000 (UTC) (envelope-from kudzu@tenebras.com) Authentication-Results: mx1.freebsd.org; none Received: by mail-pj1-x102e.google.com with SMTP id 98e67ed59e1d1-3114c943367so319171a91.1 for ; Wed, 04 Jun 2025 13:27:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tenebras-com.20230601.gappssmtp.com; s=20230601; t=1749068844; x=1749673644; darn=freebsd.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=vS7zkXTdPwBHaXS8vVIeNZQFfugM7Pfr/F+GptA0RkQ=; b=T/Mk9bfL3w066QoMPTZeP1tHy6pVwY8KL+6kEqqNuUveRztiVPzQaWwpsIeq9wguPp uTfNmcPZ21LGzRTU3Ce2dtqLTMwOPDBCbu48ayLOtHBt75VJx5aReu9BWPAN1w1tN/cM fW9LNLHKVvOsY8RdHBTrnWR9vTNZahC19JlmuGfN+WlKgIWblf/LC7S9n2PRE62qjXOp 6QkqmPinkU945hK92wz8xoyhgFvO5UKeTTRUvVlhpu7zjg8yHdV9V36bZ4h20XgoDOs+ 85Qrzt5lQMhrJNmdJI4/w9P/xkJbJU995Y6kyDzLmgkY+v/MATSqpcrdOszJ+2aZQaMm QyOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1749068844; x=1749673644; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=vS7zkXTdPwBHaXS8vVIeNZQFfugM7Pfr/F+GptA0RkQ=; b=AivNUry0t8L1v+UFOBSIOez7aUHNDu5MvRfyr4A4vSxBlVo/AEjQL0sjntC2Z07DcS M2nEa1BOhKO7Vxfbu3sCMbiB4b3DTmuucFe5avt1LSaoRvo5Xot0q81g560KhoYRcicB BWbVYPl6HMlLoDiFDIc8/kj86NrWtXFWYZnZPMurxNrpdE3at7qSg5iVcBCQCFJTcc8p 9vYI+iD7qyYYKNnurh/r0k0R2LKRJOqn2D1Izfx04L1TTiI5i3EtXSB6Xwb60qodsgMT 5BsgQIySBI6oVQksOST31+Ipky3l6dCKZbAKoUGkd8diYXtK/1OAH1W8SvsB4bsrpw0T K+1g== X-Forwarded-Encrypted: i=1; AJvYcCXogkqU5voV9wBCcr3LXj7tcaPGdRGiUtDqVTPgJLf53iJOKvObMIKZ6p7FahW8/9Jwc4IUtQGA300=@freebsd.org X-Gm-Message-State: AOJu0YyoYZD4SpUxtjy3Ykhh7MX6z3tlMMmzbGs+LL9XfHe74UmBGU7u Y5FR3ePtIXPVVr6gGcEUur9d3PFOVnRf0t5D3VpA5vJAjTawh/bIm3xMxLXDmG6El+FeCBtMHfP EpRgTLNjnl1exYtnEybmd4XF4WMF2tfP2Q7QnvgGL9Q== X-Gm-Gg: ASbGnct0DPriHMlqkS7CBY2YWLccTH0BRUnY0JjIqjxuo5pwFR65Disus8saD+P/lGD BmQxuPQxqP03otkuXYL90S9R1CflgNXzVTacxcGtzW6mB/M49hSTBMQW0UsDcpYIHHt9l11DQCV a896x1H/W7woFIwtpj6cq4Fm9cXYsiKL0drUtUSz7xGczOKE2GcaO1Y3VNRLGqSKmw6MObu4MPF Ugz X-Google-Smtp-Source: AGHT+IFvrChKFBB26YdQPkswLeQJwRgyhqWwLwKJdL4NecU3zXrJV53PnidRaQMvStcsMzw5wyfs5gj2uqYcqZO9Kmk= X-Received: by 2002:a17:90b:1c0a:b0:311:b0ec:135b with SMTP id 98e67ed59e1d1-3130cd689c0mr6433522a91.24.1749068843513; Wed, 04 Jun 2025 13:27:23 -0700 (PDT) List-Id: User questions List-Archive: https://lists.freebsd.org/archives/freebsd-questions List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-questions@freebsd.org Sender: owner-freebsd-questions@FreeBSD.org MIME-Version: 1.0 References: <9728060D-2C02-426B-BACE-F2D2F651A62F@cretaforce.gr> <13C8668F-0594-4D6D-AFE3-C9DC676570B9@cretaforce.gr> In-Reply-To: <13C8668F-0594-4D6D-AFE3-C9DC676570B9@cretaforce.gr> From: Michael Sierchio Date: Wed, 4 Jun 2025 16:26:46 -0400 X-Gm-Features: AX0GCFszigHR5i1IlTzXS6eTQsAquXrdz34-rC8CMZlK4a86psDFOYjr-kDGxzE Message-ID: Subject: Re: Problem with net.inet.tcp.path_mtu_discovery=1 To: Christos Chatzaras Cc: Michael Tuexen , questions@freebsd.org, freebsd-net Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 4bCJzJ6tVWz44wt X-Spamd-Bar: ---- X-Rspamd-Pre-Result: action=no action; module=replies; Message is reply to one we originated X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US] On Wed, Jun 4, 2025 at 3:58=E2=80=AFPM Christos Chatzaras wrote: > > With these settings, is the connection supposed to work even if an interm= ediate router is dropping the ICMP messages required for Path MTU Discovery= ? I tried this configuration, but it didn=E2=80=99t resolve the issue. No. Path MTU Discovery breaks if you drop the ICMP "fragmentation needed and DF set" packet is sent.