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diff --git a/tools/regression/netinet/ip_id_period/ip_id_period.py b/tools/regression/netinet/ip_id_period/ip_id_period.py
new file mode 100644
index 000000000000..7e6e0132de1d
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+++ b/tools/regression/netinet/ip_id_period/ip_id_period.py
@@ -0,0 +1,76 @@
+# Copyright (C) 2008 Michael J. Silbersack.  All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice unmodified, this list of conditions, and the following
+#    disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+# This is a regression test to verify the proper behavior of IP ID generation
+# code.  It will push 200000 packets, then report back what the min and max
+# periods it saw for different IDs were.
+
+import os
+import signal
+import subprocess
+import time
+
+if os.path.exists('results.pcap'):
+    os.remove('results.pcap')
+tcpdump = subprocess.Popen('tcpdump -n -i lo0 -w results.pcap icmp', shell=True)
+time.sleep(1) # Give tcpdump time to start
+
+os.system('sysctl net.inet.icmp.icmplim=0')
+os.system('ping -q -i .001 -c 100000 127.0.0.1')
+
+time.sleep(3) # Give tcpdump time to catch up
+os.kill(tcpdump.pid, signal.SIGTERM)
+
+os.system('tcpdump -n -v -r results.pcap > results.txt')
+
+id_lastseen = {}
+id_minperiod = {}
+
+count = 0
+for line in open('results.txt').readlines():
+    id = int(line.split(' id ')[1].split(',')[0])
+    if id_lastseen.has_key(id):
+        period = count - id_lastseen[id]
+        if not id_minperiod.has_key(id) or period < id_minperiod[id]:
+            id_minperiod[id] = period
+    id_lastseen[id] = count
+    count += 1
+
+sorted_minperiod = zip(*reversed(zip(*id_minperiod.items())))
+sorted_minperiod.sort()
+
+print "Lowest 10 ID periods detected:"
+x = 0
+while x < 10:
+    id_tuple = sorted_minperiod.pop(0)
+    print "id: %d period: %d" % (id_tuple[1], id_tuple[0])
+    x += 1
+
+print "Highest 10 ID periods detected:"
+x = 0
+while x < 10:
+    id_tuple = sorted_minperiod.pop()
+    print "id: %d period: %d" % (id_tuple[1], id_tuple[0])
+    x += 1