Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 23 Feb 2001 18:22:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 23 Feb 2001 18:22:21 -0500 Received: from eschelon.gamesquad.net ([216.115.239.45]:27655 "HELO eschelon.gamesquad.net") by vger.kernel.org with SMTP id ; Fri, 23 Feb 2001 18:22:16 -0500 From: "Vibol Hou" To: "Linux-Kernel" Subject: UDP attack? How to suppress kernel msgs? Date: Fri, 23 Feb 2001 15:21:51 -0800 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 Importance: Normal Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, One of my servers running 2.4.1 was attacked earlier today. I have a strong feeling it went down because the kernel was logging too many messages to syslog. There's over 100,000 lines of the following in my syslog: Feb 23 12:28:25 omega kernel: UDP: bad checksum. From 202.96.140.146:20567 to 21 6.115.239.40:113 ulen 1472 Feb 23 12:28:25 omega kernel: UDP: bad checksum. From 209.249.213.145:36338 to 2 16.115.239.40:113 ulen 1472 Feb 23 12:28:25 omega kernel: UDP: bad checksum. From 194.225.45.233:33762 to 21 6.115.239.40:113 ulen 1472 Feb 23 12:28:25 omega kernel: UDP: bad checksum. From 211.54.39.161:14958 to 216 .115.239.40:113 ulen 1472 Feb 23 12:28:25 omega kernel: UDP: bad checksum. From 202.96.140.167:3467 to 216 .115.239.40:113 ulen 1472 How do I suppress these types of messages from hogging up all the CPU? Thanks, Vibol Hou - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/