From owner-freebsd-net@freebsd.org Sun Nov 19 14:34:00 2017 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 00AABDF6BC6 for ; Sun, 19 Nov 2017 14:33:59 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [78.47.246.247]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 849D67A367 for ; Sun, 19 Nov 2017 14:33:58 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (root@eg.sd.rdtc.ru [62.231.161.221] (may be forged)) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id vAJEXpRq082157 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 19 Nov 2017 15:33:51 +0100 (CET) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: karl@denninger.net Received: from [10.58.0.4] ([10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id vAJEXlSj043561 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Sun, 19 Nov 2017 21:33:48 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: OpenVPN vs IPSec To: Karl Denninger , freebsd-net@freebsd.org References: <20171118165842.GA73810@admin.sibptus.transneft.ru> <20171119120832.GA82727@admin.sibptus.transneft.ru> <5A11882D.1050700@quip.cz> From: Eugene Grosbein Message-ID: <5A119648.4080707@grosbein.net> Date: Sun, 19 Nov 2017 21:33:44 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.7.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=2.2 required=5.0 tests=BAYES_00, LOCAL_FROM, RDNS_NONE autolearn=no autolearn_force=no version=3.4.1 X-Spam-Report: * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 2.6 LOCAL_FROM From my domains * 1.9 RDNS_NONE Delivered to internal network by a host with no rDNS X-Spam-Level: ** X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on hz.grosbein.net X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 19 Nov 2017 14:34:00 -0000 19.11.2017 21:15, Karl Denninger wrote: > The reason is Windows. Microslug hasn't updated their client since at > least Windows 7 release (we're talking about over a decade now) and > their IKEv2 implementation doesn't support IKE fragmentation. In > today's world this usually means IPSEC/IKEv2 won't connect at all > because someone in the middle drops UDP fragments on purpose. > > I'd like to ram that up someone's chute out at Microslug, never mind > that their default proposals are intentionally insecure (gee, I wonder > if someone in the government "asked nicely" for that?) That's fixable > with a bit of registry editing, but the lack of IKEv2 frag support is a > killer and has basically forced me to support OpenVPN when there are > windows clients around and you have no control (at all) over the > networks in the middle between the client and server. I was able to successfully connect Windows 8.1 client to FreeBSD 11.1 server in the L2TP/IPSEC mode using ipsec-tools (racoon) plus mpd5. You can use something like mtu=576 for L2TP ngX interface to avoid UDP fragmentation. Have you tried that?