netdev - Re: ICMP echo reply fails

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Message-ID: <1269641190.2256.1.camel@edumazet-laptop>
Date:	Fri, 26 Mar 2010 23:06:30 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andy Fleming <afleming@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: ICMP echo reply fails

Le vendredi 26 mars 2010 à 16:48 -0500, Andy Fleming a écrit :
> 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


kernel version ?

NIC driver ?

Are ICMP echo request received ? (grep Icmp /proc/net/snmp)


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