diff --git a/tests/sys/netpfil/pf/rdr.sh b/tests/sys/netpfil/pf/rdr.sh
new file mode 100644
--- /dev/null
+++ b/tests/sys/netpfil/pf/rdr.sh
@@ -0,0 +1,114 @@
+#
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright © 2023 Tom Jones <thj@freebsd.org>
+#
+# 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.
+
+. $(atf_get_srcdir)/utils.subr
+
+atf_test_case "tcp_v6" "cleanup"
+tcp_v6_head()
+{
+	atf_set descr 'TCP rdr with IPv6'
+	atf_set require.user root
+	atf_set require.progs scapy python3
+}
+
+tcp_v6_body()
+{
+	j="rdr:tcp_v6"
+	epair_one=$(vnet_mkepair)
+	epair_two=$(vnet_mkepair)
+
+	echo $epair_one
+	echo $epair_two
+
+	vnet_mkjail ${j}a ${epair_one}b
+	vnet_mkjail ${j}b ${epair_one}a ${epair_two}a
+	vnet_mkjail ${j}c ${epair_two}b
+
+	# configure addresses for b
+	jexec ${j}b ifconfig lo0 up
+	jexec ${j}b ifconfig ${epair_one}a inet6 2001:db8:a::1/64 up no_dad
+	jexec ${j}b ifconfig ${epair_two}a inet6 2001:db8:b::1/64 up no_dad
+
+	# configure addresses for a
+	jexec ${j}a ifconfig lo0 up
+	jexec ${j}a ifconfig ${epair_one}b inet6 2001:db8:a::2/64 up no_dad
+
+	# configure addresses for c
+	jexec ${j}c ifconfig lo0 up
+	jexec ${j}c ifconfig ${epair_two}b inet6 2001:db8:b::2/64 up no_dad
+
+	# enable forwarding in the b jail
+	jexec ${j}b sysctl net.inet6.ip6.forwarding=1
+
+	# add routes so a and c can find each other
+	jexec ${j}a route add -inet6 2001:db8:b::0/64 2001:db8:a::1
+	jexec ${j}c route add -inet6 2001:db8:a::0/64 2001:db8:b::1
+
+	jexec ${j}b pfctl -e
+
+	pft_set_rules ${j}b \
+		"rdr on ${epair_one}a proto tcp from any to any port 80 -> 2001:db8:b::2 port 8000"
+
+	# Check that a can reach c over the router
+	atf_check -s exit:0 -o ignore \
+	    jexec ${j}a ping -6 -c 1 2001:db8:b::2
+
+	# capture packets on c so we can look for incorrect checksums
+	# (see 210860)
+	jexec ${j}c tcpdump -w ${j}.pcap tcp and port 8000 &
+	tcpdumppid=$!
+
+	# start a web server and give it a second to start
+	jexec ${j}c python3 -m http.server &
+	httppid=$!
+	sleep 1
+
+	# http directly from a to c -> a ---> b
+	atf_check -s exit:0 -o ignore \
+		jexec ${j}a fetch -T 1 -o /dev/null -q "http://[2001:db8:b::2]:8000"
+
+	# http from a to b with a redirect  -> a ---> b
+	atf_check -s exit:0 -o ignore \
+		jexec ${j}a fetch -T 1 -o /dev/null -q "http://[2001:db8:a::1]:80"
+
+	jexec ${j}c kill $httppid
+	jexec ${j}c kill $tcpdumppid
+
+	atf_check -s exit:0 -o inline:"       0" \
+		jexec ${j}c tcpdump -vvvv -r ${j}.pcap 2>/dev/null |\
+		grep incorrect | wc -l
+}
+
+tcp_v6_cleanup()
+{
+	pft_cleanup
+}
+
+atf_init_test_cases()
+{
+	atf_add_test_case "tcp_v6"
+}