From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1Kawdo-00078C-Pc for user-mode-linux-devel@lists.sourceforge.net; Wed, 03 Sep 2008 10:59:40 -0700 Received: from [198.99.130.12] (helo=saraswathi.solana.com) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1Kawdn-0002Ho-8p for user-mode-linux-devel@lists.sourceforge.net; Wed, 03 Sep 2008 10:59:40 -0700 Date: Wed, 3 Sep 2008 13:59:33 -0400 From: Jeff Dike Message-ID: <20080903175933.GB9917@c2.user-mode-linux.org> References: <48BC0DE7.1000703@unilim.fr> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <48BC0DE7.1000703@unilim.fr> Subject: Re: [uml-devel] Connecting UML_SWITCH and Wireshark List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: user-mode-linux-devel-bounces@lists.sourceforge.net Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net To: Julien Iguchi-Cartigny Cc: user-mode-linux-devel@lists.sourceforge.net On Mon, Sep 01, 2008 at 05:44:39PM +0200, Julien Iguchi-Cartigny wrote: > I'm using Netkit (www.netkit.org): it's a network simulator using UML > and I want to show packets exchanged between the UML machines. I believe > the best way is to > > - use wireshark with the flag "-" to capture packets in the standard input. > - use netcat to read the data socket of uml_switch and print to the > standard output > > But uml_switch uses a ctl socket to open new port. I need a way to > manually open a port by uml_switch to connect netcat. I don't think > uml_switch offer command-line instruction for this, so is the best way > to write a short program writing on the ctl socket of uml_switch ? If > yes, what data to send to uml_switch ? If you want to capture UML network traffic going over uml_switch (be it with wireshark or tcpdump - it doesn't matter), there are two basic ways of doing it: enable hub mode (uml_switch -hub) and then either sniff from a UML's eth0 (a third UML if you don't want to interfere with the communicating UMLs), or add a host tap device to the switch (uml_switch -tap tap) and sniff that. Jeff -- Work email - jdike at linux dot intel dot com ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel