The ping6 binary went away over 7 years ago [0].

[0]: 
https://github.com/iputils/iputils/commit/ebad35fee3de851b809c7b72ccc654a72b6af61d

Co-developed-by: Antony Antony <[email protected]>
Signed-off-by: Antony Antony <[email protected]>
Signed-off-by: Daniel Xu <[email protected]>
---
 tools/testing/selftests/bpf/test_tunnel.sh | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_tunnel.sh 
b/tools/testing/selftests/bpf/test_tunnel.sh
index 2dec7dbf29a2..85ba39992461 100755
--- a/tools/testing/selftests/bpf/test_tunnel.sh
+++ b/tools/testing/selftests/bpf/test_tunnel.sh
@@ -295,13 +295,13 @@ test_ip6gre()
        add_ip6gretap_tunnel
        attach_bpf $DEV ip6gretap_set_tunnel ip6gretap_get_tunnel
        # underlay
-       ping6 $PING_ARG ::11
+       ping -6 $PING_ARG ::11
        # overlay: ipv4 over ipv6
        ip netns exec at_ns0 ping $PING_ARG 10.1.1.200
        ping $PING_ARG 10.1.1.100
        check_err $?
        # overlay: ipv6 over ipv6
-       ip netns exec at_ns0 ping6 $PING_ARG fc80::200
+       ip netns exec at_ns0 ping -6 $PING_ARG fc80::200
        check_err $?
        cleanup
 
@@ -324,13 +324,13 @@ test_ip6gretap()
        add_ip6gretap_tunnel
        attach_bpf $DEV ip6gretap_set_tunnel ip6gretap_get_tunnel
        # underlay
-       ping6 $PING_ARG ::11
+       ping -6 $PING_ARG ::11
        # overlay: ipv4 over ipv6
        ip netns exec at_ns0 ping $PING_ARG 10.1.1.200
        ping $PING_ARG 10.1.1.100
        check_err $?
        # overlay: ipv6 over ipv6
-       ip netns exec at_ns0 ping6 $PING_ARG fc80::200
+       ip netns exec at_ns0 ping -6 $PING_ARG fc80::200
        check_err $?
        cleanup
 
@@ -376,7 +376,7 @@ test_ip6erspan()
        config_device
        add_ip6erspan_tunnel $1
        attach_bpf $DEV ip4ip6erspan_set_tunnel ip4ip6erspan_get_tunnel
-       ping6 $PING_ARG ::11
+       ping -6 $PING_ARG ::11
        ip netns exec at_ns0 ping $PING_ARG 10.1.1.200
        check_err $?
        cleanup
@@ -474,7 +474,7 @@ test_ipip6()
        ip link set dev veth1 mtu 1500
        attach_bpf $DEV ipip6_set_tunnel ipip6_get_tunnel
        # underlay
-       ping6 $PING_ARG ::11
+       ping -6 $PING_ARG ::11
        # ip4 over ip6
        ping $PING_ARG 10.1.1.100
        check_err $?
@@ -502,11 +502,11 @@ test_ip6ip6()
        ip link set dev veth1 mtu 1500
        attach_bpf $DEV ip6ip6_set_tunnel ip6ip6_get_tunnel
        # underlay
-       ping6 $PING_ARG ::11
+       ping -6 $PING_ARG ::11
        # ip6 over ip6
-       ping6 $PING_ARG 1::11
+       ping -6 $PING_ARG 1::11
        check_err $?
-       ip netns exec at_ns0 ping6 $PING_ARG 1::22
+       ip netns exec at_ns0 ping -6 $PING_ARG 1::22
        check_err $?
        cleanup
 
-- 
2.42.1


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