[89844] in North American Network Operators' Group
Re: Open Letter to D-Link about their NTP vandalism
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Mon Apr 10 00:05:44 2006
To: Nicholas Suan <nsuan@nonexiste.net>
Cc: "Church, Chuck" <cchurch@netcogov.com>, nanog@nanog.org
In-Reply-To: Your message of "Sat, 08 Apr 2006 11:17:20 CDT."
<20060408161720.GA2863@nonexiste.net>
From: Valdis.Kletnieks@vt.edu
Date: Mon, 10 Apr 2006 00:05:17 -0400
Errors-To: owner-nanog@merit.edu
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On Sat, 08 Apr 2006 11:17:20 CDT, Nicholas Suan said:
> It would be nice if it were that simple. However there are an annoyingly
> large amount of poorly-written clients whose polling ratios do not
> decrease after they get no response from the server. There have even
> been some clients whose polling rate *increases* after they get no
> response.
One particular piece of crapware of the tucows archive variety would retry
once per second if it hadn't heard a response - but a ICMP Port Unreachable
would trigger an *immediate* query, so it would basically re-query at whatever
the RTT for the path was.
Said software was why instead of leaving NTP disabled on the before-mentioned
box, and hoping that at least *some* people would clue in from the ICMP reply,
I had to basically firewall and drop the packets entirely.
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