I'm just spit balling, but this doesn't sound like good normal behavior. Off handedly it sounds like a DNS poison or transfer attempt. I'm not entirely certain a centos mailing list is a good venue for this question. I would try asking in SecurityFocus. Geoff Sent from my BlackBerry wireless handheld. -----Original Message----- From: Rick Barnes <linux@xxxxxxxxxxxxxx> Date: Thu, 04 Oct 2007 17:42:19 To:CentOS mailing list <centos@xxxxxxxxxx> Subject: [CentOS] [OT] DNS queries issue Hello, I have a 2 bind nameservers on my network (both running C3.9). Over the last 3 weeks, I've seen a significant increase in the amount of denied cache queries to DNS service and I'm wondering if I should be worried or if there's something I can do to resolve or prevent this. I show millions of lines like: Oct 4 11:49:30 dns1 named[878]: client 68.13.16.20#53535: query (cache) denied If I trim out those and the last message repeated lines, I go from a messages log of 1.8GB to 1.3MB but 2 weeks earlier my messages log for the week was only 339M. Googling for the query (cache) denied didn't seem find anything useful, that this is other name servers attempting to query my servers for info. Its this something I need to bear with in having a publically available DNS server with authoritative domains? Is there a way to suppress these messages from going to syslog and is it a bad idea to do so? There have been no configuration changes except to add 1 or 2 domains to the nameservers. Any help in understanding this would be great. Thanks, Rick _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos
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