From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesper Dangaard Brouer Subject: BUG: NIU driver: strange issues with multicast "UDP: short packet" Date: Tue, 03 Feb 2009 14:38:20 +0100 Message-ID: <1233668300.20497.49.camel@localhost.localdomain> Reply-To: jdb@comx.dk Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: "netdev@vger.kernel.org" To: "David S. Miller" Return-path: Received: from lanfw001a.cxnet.dk ([87.72.215.196]:48548 "EHLO lanfw001a.cxnet.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752290AbZBCNiX (ORCPT ); Tue, 3 Feb 2009 08:38:23 -0500 Sender: netdev-owner@vger.kernel.org List-ID: I have this strange issues with multicast and the NIU driver (Sun neptune Quad NIC). When receiving multicast traffic the kernel log spams with something like this: __ratelimit: 5071 callbacks suppressed UDP: short packet: From 81.161.2.106:0 44063/1324 to 233.123.173.7:0 UDP: short packet: From 81.161.2.106:0 44063/1324 to 233.123.173.7:0 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 __ratelimit: 3555 callbacks suppressed UDP: short packet: From 81.161.2.106:0 49320/1324 to 233.123.173.7:0 UDP: short packet: From 81.161.2.106:0 49320/1324 to 233.123.173.7:0 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 UDP: short packet: From 81.161.2.106:8304 27493/1324 to 233.123.173.7:24931 Tcpdumping the packets, the contents of the packets are correct. The next strange thing is that I can make the log messages go away, if I setup a static multicast route out another interface. smcroute -a eth52 81.161.2.106 233.123.173.7 eth21 Any hints whats going wrong? -- Med venlig hilsen / Best regards Jesper Brouer ComX Networks A/S Linux Network developer Cand. Scient Datalog / MSc. Author of http://adsl-optimizer.dk LinkedIn: http://www.linkedin.com/in/brouer