From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Fleming Subject: ICMP echo reply fails Date: Fri, 26 Mar 2010 16:48:22 -0500 Message-ID: <2acbd3e41003261448q26cb19d4w63487894b24f0254@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 To: netdev@vger.kernel.org Return-path: Received: from mail-ww0-f46.google.com ([74.125.82.46]:39669 "EHLO mail-ww0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752413Ab0CZVsY (ORCPT ); Fri, 26 Mar 2010 17:48:24 -0400 Received: by wwe15 with SMTP id 15so6956847wwe.19 for ; Fri, 26 Mar 2010 14:48:22 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: For various reasons, we have been running a stress test on one of our boards. The test consists of initiating 2-3 flood pings from a Windows box running Cygwin, plus one additional ping we use as a "heartbeat". The ping flood is overwhelming our board (we're dropping packets at a prodigious rate), but the board continues to respond for a while. In addition, we are running a script on the board which alternates bringing up and bringing down the interface every ten seconds. After a highly variable amount of time, the board stops replying to the pings. We suspected a driver issue, however, on closer inspection, we are still able to send and receive packets (I can ping *from* the board to the PC, and I can *telnet* from the PC to the board). We tried pinging the board from another PC, and it also failed. Essentially, ICMP echo requests are being ignored (A glance at memory indicates that packets are arriving, but no packets are being enqueued to the ethernet controller). We still have a lot more debugging to do, but I was wondering if anyone had ever seen something like this, or might be quicker to realize the obvious mistake we're making. Thanks, Andy Fleming