From nobody Tue Apr 05 22:07:58 2022 X-Original-To: freebsd-net@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 67BB61A86EF3 for ; Tue, 5 Apr 2022 22:08:11 +0000 (UTC) (envelope-from dmarquess@gmail.com) Received: from mail-ej1-x62c.google.com (mail-ej1-x62c.google.com [IPv6:2a00:1450:4864:20::62c]) (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 "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4KY1x65pY0z4sd2 for ; Tue, 5 Apr 2022 22:08:10 +0000 (UTC) (envelope-from dmarquess@gmail.com) Received: by mail-ej1-x62c.google.com with SMTP id qh7so480485ejb.11 for ; Tue, 05 Apr 2022 15:08:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=m3j+jse/7F5LshudNljE+yhWCQnMXAr3VlTijV7m3H8=; b=nx/S4Ns+4m251EaOHmT0hzocDd3+0hkrA++T9h2WMjrWtpVuZ6tp1AlDN7blEck5Bh UvwzTbOGByNVzFEoFSagdcgw3pXgOLD1cmzLQcXY4l/vFVtshLsyjl3oiJvPrCcGVQSb BCOw5a34Yc0Gp3wUTQDDVLVxnjELOD6rk7KNS4dGiYlarQsX6q816IwlAYqg690mr/cJ DrrNMonaEVs86hXV/u9uRTU3VRz8kBE+9jrHZSXZV8YBVzVZu3wviYp/mMCFrtmjY+zE zhOfkh86Paz7D/DL078bWIPCz7IeJdMK22gRMs7rqcTWnePZJSS9F78Y4Ks7igdxu/1c QlGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=m3j+jse/7F5LshudNljE+yhWCQnMXAr3VlTijV7m3H8=; b=26dJ/01AE+c1JdFunMprF251Bio1gGUSEFIYfgyOlS2/7UvqWiCXUrLujYv7vT7ikJ +9hb8ZI4DeOMQz9pvEmk3GoFFbenco5iLOMKk+f5NPEzgis9AwJnDGgHs0QBmnzLbpbT q+Lp0dF+M1wUQ3uNm+5Qr7xyr5LRr25WwBkzCD8GTOxaOR8AxRCoJz3m2Q17BUnf5RiL ZD+A5mBXbRHo1h/lBtS5tc4qB0xmFbHra1hhdQ8ccNWTjrEn+0VklHnBLD6uTpq1k6Z+ ARf++GPvRnsXClw5gYuFNUygotYJdUtMliWCOECxdLqcDog+Dn3kSmniTo7L6PK9gjEw 6Wqg== X-Gm-Message-State: AOAM531XYXgXu7YAZpiW/tVAlFtWIs5rmcH5XaiP+W4F8UV+fm9dSpSl zzHc+bR0KFhjszyQgp/8BhUeD+vxmY8UuKMUUKjbJ9TWkF0= X-Google-Smtp-Source: ABdhPJyZEEqeEZrZgOBXK11FWJNdBp+5Xhf/Gp6tmH1S4p722Gkx7DrxcG6N300T1rm+qNIxcAhF2St/c1NOlgABzlA= X-Received: by 2002:a17:907:7da8:b0:6e0:5b94:5ed8 with SMTP id oz40-20020a1709077da800b006e05b945ed8mr5302624ejc.312.1649196489418; Tue, 05 Apr 2022 15:08:09 -0700 (PDT) List-Id: Networking and TCP/IP with FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-net List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-net@freebsd.org MIME-Version: 1.0 References: <202204051443.IAA22257@mail.lariat.net> In-Reply-To: <202204051443.IAA22257@mail.lariat.net> From: Dustin Marquess Date: Tue, 5 Apr 2022 17:07:58 -0500 Message-ID: Subject: Re: Wireguard, MTUs, and jumbo packets To: freebsd-net@brettglass.com Cc: "Patrick M. Hausen" , "freebsd-net@freebsd.org" Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 4KY1x65pY0z4sd2 X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20210112 header.b="nx/S4Ns+"; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of dmarquess@gmail.com designates 2a00:1450:4864:20::62c as permitted sender) smtp.mailfrom=dmarquess@gmail.com X-Spamd-Result: default: False [-4.00 / 15.00]; TO_DN_EQ_ADDR_SOME(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; MID_RHS_MATCH_FROMTLD(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20210112]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-net@freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::62c:from]; MLMMJ_DEST(0.00)[freebsd-net]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] X-ThisMailContainsUnwantedMimeParts: N On Tue, Apr 5, 2022 at 9:46 AM wrote: > > Interesting. That 60 byte overhead (which I understand is intended > to make the protocol connectionless) is concerning, because to send > a 1500 byte packet one needs to have enabled jumbo packets along > the entire path. Otherwise, there will be a lot of fragmentation... > which in turn will create yet more overhead. Strangely, I'm seeing a 96-byte overhead over IPv4, maybe because I'm using a PSK also? I'm seeing a 90-byte overhead with IKEv2, though, so an extra 6 bytes isn't a huge deal to me. -Dustin