Date: Wed, 19 Jul 2006 10:02:19 +0100 From: David Pick <d.m.pick@qmul.ac.uk> To: George Mamalakis <mamalos@lan.gr> Cc: freebsd-security@freebsd.org Subject: Re: UDP connection attempts Message-ID: <E1G37wh-000HMc-00@xi.css.qmw.ac.uk> In-Reply-To: Your message of "Wed, 19 Jul 2006 12:07:08 %2B0300." <20060719114613.N18979@ns1.lan.gr>
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I get similar messages to these: > Jul 19 03:25:56 ns1 kernel: Connection attempt to UDP myexternaladdress:52299 from myexternaladdress:53 > Jul 19 09:33:11 ns1 kernel: Connection attempt to UDP myexternaladdress:52316 from myexternaladdress:53 occasionally when a DNS server takes a long time to respond because a UDP "keep state" *has* to time out eventually, and if the configured interval is less than the DNS server response time the returning DNS response will not match any "kept" entry. Tuning the interval will reduce the messages, and allow the response packets through, but it will still happen *sometimes*. -- David Pick
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