From: Aaron Wiebe Subject: Re: [NFS] nfs-over-tcp still needs udp ports? (SLES 11) Date: Thu, 7 May 2009 12:08:17 -0400 Message-ID: References: <4A02DAA8.6050005@bio.ifi.lmu.de> <4A02FDC3.9090709@bio.ifi.lmu.de> <4a02ffdf.1ac1f10a.637d.ffffbc3a@mx.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" To: Tom Talpey , Frank Steiner , Leonardo Chiquitto , nfs@lists.sourceforge.net Return-path: Received: from neil.brown.name ([220.233.11.133]:39401 "EHLO neil.brown.name" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754134AbZEGQKa (ORCPT ); Thu, 7 May 2009 12:10:30 -0400 Received: from brown by neil.brown.name with local (Exim 4.69) (envelope-from ) id 1M26B1-0006wr-2q for linux-nfs@vger.kernel.org; Fri, 08 May 2009 02:10:27 +1000 In-Reply-To: <4a02ffdf.1ac1f10a.637d.ffffbc3a-ATjtLOhZ0NVl57MIdRCFDg@public.gmane.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: On Thu, May 7, 2009 at 11:35 AM, Tom Talpey wrote: > > There is one small caveat to using mountproto=tcp through firewalls: > while the mount will succeed, there are some side protocol exchanges > which may not. > > In particular, if you do NLM file locking, there is a server callback (NLM > "granted") which the server may choose to issue via UDP. If this callback > is not seen by the client due to firewall blocking, there may be a 30-second > pause before a client retry unblocks the caller. > > Also, the NSM (status monitor) exchanges are often performed via UDP. > Again, if you are using NLM and the server reboots, the client may not > become aware of this promptly, and lock reclaim will be affected. Sorry for the slight threadjack, but a question along those lines... My understanding is that currently portmap will not bind any UDP NLM listeners unless there are UDP mounts on the machine. I know there are servers out there that will always speak NLM over UDP (netapp/ontap being the prominent one), and as a result there can be problems without firewalls. If servers are out there that will speak NLM over UDP regardless of the mount itself, shouldn't we be binding NLM/UDP regardless of the mount transport? (Or did I miss this change being reverted a while back?) -Aaron ------------------------------------------------------------------------------ The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your production scanning environment may not be a perfect world - but thanks to Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700 Series Scanner you'll get full speed at 300 dpi even with all image processing features enabled. http://p.sf.net/sfu/kodak-com _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs _______________________________________________ Please note that nfs@lists.sourceforge.net is being discontinued. Please subscribe to linux-nfs@vger.kernel.org instead. http://vger.kernel.org/vger-lists.html#linux-nfs