04-26-2008
One obvious choke point is the firewall. Does the system have a firewall of its own? Do you get log messages somewhere useful (I'd be looking at /var/log/messages but FreeBSD might be different than Linux in that regard) when attempting to connect from an outside IP?
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LEARN ABOUT DEBIAN
dns-flood-detector
DNS-FLOOD-DETECTOR(8) dns flood detection tool DNS-FLOOD-DETECTOR(8)
NAME
DNS-FLOOD-DETECTOR - dns flood detection and alert tool
SYNOPSIS
dns-flood-detector [-b|-d] [-v] [-h] [-i device] [-t n] [-a n] [-w n] [-x n] [-m n]
DESCRIPTION
DNS Flood Detector was developed to detect abusive usage levels on high traffic nameservers and to enable quick response to the use of
one's nameserver to facilitate spam.
OPTIONS
-b run in foreground in bindsnap mode
-d run in background in daemon mode
-v verbose output - use again for more verbosity
-h display help
-i device
specify device name to listen on
-t n alarm at >n queries per second
-a n reset alarm after n seconds
-w n calculate stats every n seconds
-x n create n buckets
-m n report overall stats every n seconds
SEE ALSO
Website <http://www.adotout.com/>
AUTHOR
DNS-FLOOD-DETECTOR was written by Dennis Opacki <dopacki@adotout.com>.
This manual page was written by Jan Wagner <waja@cyconet.org>, for the Debian project (but may be used by others).
1.10 2006-11-03 DNS-FLOOD-DETECTOR(8)