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diff --git a/tests/sys/netpfil/pf/Makefile b/tests/sys/netpfil/pf/Makefile
--- a/tests/sys/netpfil/pf/Makefile
+++ b/tests/sys/netpfil/pf/Makefile
@@ -28,6 +28,7 @@
modulate \
names \
nat \
+ nat64 \
pass_block \
pflog \
pflow \
diff --git a/tests/sys/netpfil/pf/nat64.sh b/tests/sys/netpfil/pf/nat64.sh
new file mode 100644
--- /dev/null
+++ b/tests/sys/netpfil/pf/nat64.sh
@@ -0,0 +1,82 @@
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2024 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.
+
+. $(atf_get_srcdir)/utils.subr
+
+atf_test_case "icmp_echo" "cleanup"
+icmp_echo_head()
+{
+ atf_set descr 'ICMP echo NAT64 test'
+ atf_set require.user root
+}
+
+icmp_echo_body()
+{
+ pft_init
+
+ epair_link=$(vnet_mkepair)
+ epair=$(vnet_mkepair)
+
+ ifconfig ${epair}a inet6 2001:db8::2/64 up no_dad
+ route -6 add default 2001:db8::1
+
+ vnet_mkjail rtr ${epair}b ${epair_link}a
+ jexec rtr ifconfig ${epair}b inet6 2001:db8::1/64 up no_dad
+ jexec rtr ifconfig ${epair_link}a 192.0.2.1/24 up
+
+ vnet_mkjail dst ${epair_link}b
+ jexec dst ifconfig ${epair_link}b 192.0.2.2/24 up
+ jexec dst route add default 192.0.2.1
+
+ # Sanity checks
+ atf_check -s exit:0 -o ignore \
+ ping6 -c 1 2001:db8::1
+ atf_check -s exit:0 -o ignore \
+ jexec dst ping -c 1 192.0.2.1
+
+ jexec rtr pfctl -e
+ pft_set_rules rtr \
+ "pass in on ${epair}b inet6 from any to 64:ff9b::/96 af-to inet from (${epair_link}a)"
+
+ # One ping
+ atf_check -s exit:0 -o ignore \
+ ping6 -c 1 64:ff9b::192.0.2.2
+
+ # Make sure packets make it even when state is established
+ atf_check -s exit:0 \
+ -o match:'5 packets transmitted, 5 packets received, 0.0% packet loss' \
+ ping6 -c 5 64:ff9b::192.0.2.2
+}
+
+icmp_echo_cleanup()
+{
+ pft_cleanup
+}
+
+atf_init_test_cases()
+{
+ atf_add_test_case "icmp_echo"
+}

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