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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 039F2C433B4 for ; Fri, 16 Apr 2021 13:56:17 +0000 (UTC) Received: from lists.zx2c4.com (lists.zx2c4.com [165.227.139.114]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C55E4610E6 for ; Fri, 16 Apr 2021 13:56:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C55E4610E6 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lonnie.abelbeck.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=wireguard-bounces@lists.zx2c4.com Received: by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTP id 69804ae3; Fri, 16 Apr 2021 13:56:13 +0000 (UTC) Received: from ibughas.pair.com (ibughas.pair.com [209.68.5.177]) by lists.zx2c4.com (ZX2C4 Mail Server) with ESMTPS id 7813f635 (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO) for ; Fri, 16 Apr 2021 13:56:06 +0000 (UTC) Received: from ibughas.pair.com (localhost [127.0.0.1]) by ibughas.pair.com (Postfix) with ESMTP id E995C1E305B; Fri, 16 Apr 2021 09:56:04 -0400 (EDT) Received: from [10.4.1.148] (wsip-70-184-211-81.om.om.cox.net [70.184.211.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ibughas.pair.com (Postfix) with ESMTPSA id C28281E304D; Fri, 16 Apr 2021 09:56:04 -0400 (EDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.17\)) Subject: Re: T-Mobile 4G/5G CGNAT vs WireGuard tunnel jitter From: Lonnie Abelbeck In-Reply-To: <15541873-A1D6-417E-A3B7-121DE0D90F22@lonnie.abelbeck.com> Date: Fri, 16 Apr 2021 08:56:04 -0500 Cc: WireGuard mailing list Content-Transfer-Encoding: quoted-printable Message-Id: References: <0BDB7408-22AC-4643-975E-1B5AC3AFADD9@lonnie.abelbeck.com> <20210410205951.14f93435@natsu> <15541873-A1D6-417E-A3B7-121DE0D90F22@lonnie.abelbeck.com> To: Roman Mamedov , Mo Balaa X-Mailer: Apple Mail (2.3445.104.17) X-BeenThere: wireguard@lists.zx2c4.com X-Mailman-Version: 2.1.30rc1 Precedence: list List-Id: Development discussion of WireGuard List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: wireguard-bounces@lists.zx2c4.com Sender: "WireGuard" > On Apr 10, 2021, at 11:12 AM, Lonnie Abelbeck = wrote: >=20 >> On Apr 10, 2021, at 10:59 AM, Roman Mamedov wrote: >>=20 >> On Sat, 10 Apr 2021 10:27:23 -0500 >> Lonnie Abelbeck wrote: >>=20 >>> I have been testing the T-Mobile Home Internet (4G/5G fixed = wireless) service to a Linode VM via WireGuard. >>>=20 >>> The TMHI service uses CGNAT plus an additional NAT in their = modem/gateway with a MTU of 1420, so WireGuard is configured with a 1340 = MTU. >>=20 >> Do they provide IPv6? I see mentions that yes, but with incoming = connections >> blocked. Might still work for WG. >=20 > Hi Roman, >=20 > TMHI uses IPv6 for their CGNAT, but AFAIK their current firmware does = not support IPv6 on the ethernet ports (I disable their WiFi). >=20 > But if (when) they support IPv6, establishing the WireGuard tunnel = over IPv6 would be great, and back to a 1420 MTU for WireGuard. A quick update, TMHI does support IPv6 via DHCPv6, but sadly has the = same MTU (1420) as IPv4 has, and IPv6 is firewalled inbound (as Roman = said). I now have the WireGuard transport endpoints using IPv6 over TMHI, but = the jitter with low bitrate traffic still occurs as with the IPv4 = transport endpoint setup. Other than that, it works quite well. Lonnie