From owner-freebsd-net@FreeBSD.ORG Wed Jan 18 06:35:54 2012 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 80899106564A for ; Wed, 18 Jan 2012 06:35:54 +0000 (UTC) (envelope-from guru@unixarea.de) Received: from ms16-1.1blu.de (ms16-1.1blu.de [89.202.0.34]) by mx1.freebsd.org (Postfix) with ESMTP id 107F58FC0A for ; Wed, 18 Jan 2012 06:35:53 +0000 (UTC) Received: from [88.217.30.188] (helo=localhost.my.domain) by ms16-1.1blu.de with esmtpsa (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.69) (envelope-from ) id 1RnP7f-0003T2-W7; Wed, 18 Jan 2012 07:35:52 +0100 Received: from localhost.my.domain (localhost [127.0.0.1]) by localhost.my.domain (8.14.4/8.14.3) with ESMTP id q0I6Zo7e002768; Wed, 18 Jan 2012 07:35:50 +0100 (CET) (envelope-from guru@unixarea.de) Received: (from guru@localhost) by localhost.my.domain (8.14.4/8.14.3/Submit) id q0I6Znqf002767; Wed, 18 Jan 2012 07:35:49 +0100 (CET) (envelope-from guru@unixarea.de) X-Authentication-Warning: localhost.my.domain: guru set sender to guru@unixarea.de using -f Date: Wed, 18 Jan 2012 07:35:49 +0100 From: Matthias Apitz To: Maciej Milewski Message-ID: <20120118063549.GA2742@tinyCurrent> References: <20120117190847.GA1255@tiny> <1784936.VLDeoQkidl@snifi> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1784936.VLDeoQkidl@snifi> X-Operating-System: FreeBSD 9.0-CURRENT r214444 (i386) User-Agent: Mutt/1.5.21 (2010-09-15) X-Con-Id: 51246 X-Originating-IP: 88.217.30.188 Cc: freebsd-net@freebsd.org Subject: Re: PPP to UMTS provider && incoming traffic (TCP, UDP) X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Matthias Apitz List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Jan 2012 06:35:54 -0000 El día Tuesday, January 17, 2012 a las 11:43:15PM +0100, Maciej Milewski escribió: > Dnia wtorek, 17 stycznia 2012 20:08:48 Matthias Apitz pisze: > > Hello, > > > > I'm used to connect my FreeBSD 10-CURRENT netbook to Internet via PPP; > > the provider in question is a German O2 UMTS provider; so far so good, > > i.e. all is working as it should: outbound HTTP, SSH, SMTP (I'm just > > sending this mail through such a connection), ... > > > > what does not work is VoIP; the call is established via SIP (using a > > STUN server), but remote audio RTP packages are not coming down; I > > checked this with TCPDUMP: only upstream RTP is send, no incoming UDP; > I observed similar problem with L2TP VPN and for me it looks that they are > blocking incoming/returning UDP traffic in public APN. > On the server side I see both incoming and outgoing traffic but device > complains that it's unable to connect. If I switch to local wireless network > then everthing works fine. I suspect that's because they are selling > special(money) APNs. Thanks for your feedback; I think too, that UDP downstream is blocked if there is not upstream UDP initialized for the same socket pair; and VoIP is using different UDP ports for up- and downstream media (audio). What I'm wondering is, how does Skype works (which is fine with my UMTS provider at the same time), have to check this with TCPDUMP... matthias -- Matthias Apitz t +49-89-61308 351 - f +49-89-61308 399 - m +49-170-4527211 e - w http://www.unixarea.de/ UNIX since V7 on PDP-11 | UNIX on mainframe since ESER 1055 (IBM /370) UNIX on x86 since SVR4.2 UnixWare 2.1.2 | FreeBSD since 2.2.5