diff --git a/tests/sys/netpfil/common/Makefile b/tests/sys/netpfil/common/Makefile
--- a/tests/sys/netpfil/common/Makefile
+++ b/tests/sys/netpfil/common/Makefile
@@ -6,6 +6,7 @@
 
 
 ATF_TESTS_SH+=	\
+		dummynet \
 		pass_block \
 		nat \
 		tos \
diff --git a/tests/sys/netpfil/common/dummynet.sh b/tests/sys/netpfil/common/dummynet.sh
new file mode 100644
--- /dev/null
+++ b/tests/sys/netpfil/common/dummynet.sh
@@ -0,0 +1,75 @@
+# $FreeBSD$
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2021 Rubicon Communications, LLC (Netgate)
+#
+# 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, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+
+. $(atf_get_srcdir)/utils.subr
+. $(atf_get_srcdir)/runner.subr
+
+pipe_head()
+{
+	atf_set descr 'Basic pipe test'
+	atf_set require.user root
+}
+
+pipe_body()
+{
+	fw=$1
+	firewall_init $fw
+	dummynet_init $fw
+
+	epair=$(vnet_mkepair)
+	vnet_mkjail alcatraz ${epair}b
+
+	ifconfig ${epair}a 192.0.2.1/24 up
+	jexec alcatraz ifconfig ${epair}b 192.0.2.2/24 up
+
+	# Sanity check
+	atf_check -s exit:0 -o ignore ping -i .1 -c 3 -s 1200 192.0.2.2
+
+	jexec alcatraz dnctl pipe 1 config bw 30Byte/s
+
+	firewall_config alcatraz ${fw} \
+		"ipfw"	\
+			"ipfw add 1000 pipe 1 ip from any to any"
+
+	# single ping succeeds just fine
+	atf_check -s exit:0 -o ignore ping -c 1 192.0.2.2
+
+	# Saturate the link
+	ping -i .1 -c 5 -s 1200 192.0.2.2
+
+	# We should now be hitting the limits and get this packet dropped.
+	atf_check -s exit:2 -o ignore ping -c 1 -s 1200 192.0.2.2
+}
+
+pipe_cleanup()
+{
+	firewall_cleanup $1
+}
+
+setup_tests		\
+	pipe		\
+		ipfw
diff --git a/tests/sys/netpfil/common/utils.subr b/tests/sys/netpfil/common/utils.subr
--- a/tests/sys/netpfil/common/utils.subr
+++ b/tests/sys/netpfil/common/utils.subr
@@ -103,6 +103,21 @@
 
 }
 
+dummynet_init()
+{
+	firewall=$1
+
+	if ! kldstat -q -m dummynet; then
+		atf_skip "This test requires dummynet"
+	fi
+
+	if [ ${firewall} == "ipfw" ]; then
+		# Nothing. This is okay.
+	else
+		atf_skip "${firewall} does not support dummynet"
+	fi
+}
+
 nat_init()
 {
 	firewall=$1