Date: Mon, 1 May 2023 16:08:18 +0200 From: Arnaud Houdelette-Langlois <arnaud.houdelette@normandie-univ.fr> To: freebsd-net@freebsd.org Subject: Re: Duplicates IP packets when using CARP and ECMP routes. Message-ID: <a82f72e5-a309-e209-d08f-540e4fb0adcc@normandie-univ.fr> In-Reply-To: <3f3507f6-fc53-444b-8730-d61143ba3c1e@app.fastmail.com> References: <e57135b2-90a2-b71e-8a7d-b80a2f638b9f@normandie-univ.fr> <3f3507f6-fc53-444b-8730-d61143ba3c1e@app.fastmail.com>
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This is a multi-part message in MIME format. --------------9qTfYlcROkBJX1PkA3bbUEh3 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Thanks for the info. I opened the PR : https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271168 Arnaud Houdelette-Langlois Administrateur des infrastructures systèmes et réseaux Normandie Université +33 2 31 56 69 54 Le 29/04/2023 à 23:44, Alexander Chernikov a écrit : > > > On Sat, 29 Apr 2023, at 11:01 AM, Arnaud Houdelette-Langlois wrote: >> >> Hi. >> >> We got a freebsd router with both ospf/bpg and multipath routes >> (ECMP) (using the new bird2 with netlink) . >> >> The router got an interface with carp enabled on it (gateway for >> admin vlan). >> >> Packets received on the carp address gets routed on all known routes >> towards destination. Thus, the destination host receives duplicates >> ip packets. (which disrupts most udp based protocols) >> >> Using a simple alias instead of carp solve the problem. Is this a >> known problem, or should I fill a PR ? >> > No, that’s not a known problem. > Please do open the PR with details. >> -- >> Arnaud Houdelette-Langlois >> Administrateur des infrastructures systèmes et réseaux >> Normandie Université >> +33 2 31 56 69 54 >> > > /Alexander --------------9qTfYlcROkBJX1PkA3bbUEh3 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> </head> <body> <p>Thanks for the info. <br> </p> <p>I opened the PR : <a class="moz-txt-link-freetext" href="https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271168">https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271168</a></p>; <p><br> </p> <pre class="moz-signature" cols="72">Arnaud Houdelette-Langlois Administrateur des infrastructures systèmes et réseaux Normandie Université +33 2 31 56 69 54</pre> <div class="moz-cite-prefix">Le 29/04/2023 à 23:44, Alexander Chernikov a écrit :<br> </div> <blockquote type="cite" cite="mid:3f3507f6-fc53-444b-8730-d61143ba3c1e@app.fastmail.com"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title></title> <style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style> <div><br> </div> <div><br> </div> <div>On Sat, 29 Apr 2023, at 11:01 AM, Arnaud Houdelette-Langlois wrote:<br> </div> <blockquote type="cite" id="qt" style=""> <p>Hi.<br> </p> <p>We got a freebsd router with both ospf/bpg and multipath routes (ECMP) (using the new bird2 with netlink) .<br> </p> <p>The router got an interface with carp enabled on it (gateway for admin vlan).<br> </p> <p>Packets received on the carp address gets routed on all known routes towards destination. Thus, the destination host receives duplicates ip packets. (which disrupts most udp based protocols)<br> </p> <p>Using a simple alias instead of carp solve the problem. Is this a known problem, or should I fill a PR ?<br> </p> </blockquote> <div>No, that’s not a known problem. <br> </div> <div>Please do open the PR with details.</div> <blockquote type="cite" id="qt" style=""> <pre class="qt-moz-signature" cols="72">-- Arnaud Houdelette-Langlois Administrateur des infrastructures systèmes et réseaux Normandie Université +33 2 31 56 69 54 </pre> <div id="qt-grammalecte_menu_main_button_shadow_host" style="width:0px;height:0px;"><br> </div> </blockquote> <div><br> </div> <div id="sig132921232"> <div class="signature">/Alexander<br> </div> </div> </blockquote> <div id="grammalecte_menu_main_button_shadow_host" style="width: 0px; height: 0px;"></div> </body> </html> --------------9qTfYlcROkBJX1PkA3bbUEh3--
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