Command: ping6 -c 4 -I br-ffr fe80:0000:0000:0000:acf3:14ff:fe1d:bc7f

Result:
Array
(
    [0] => PING fe80:0000:0000:0000:acf3:14ff:fe1d:bc7f(fe80::acf3:14ff:fe1d:bc7f) from fe80::3c9c:30ff:fe9f:b137 br-ffr: 56 data bytes
    [1] => From fe80::3c9c:30ff:fe9f:b137 icmp_seq=1 Destination unreachable: Address unreachable
    [2] => From fe80::3c9c:30ff:fe9f:b137 icmp_seq=2 Destination unreachable: Address unreachable
    [3] => From fe80::3c9c:30ff:fe9f:b137 icmp_seq=3 Destination unreachable: Address unreachable
    [4] => From fe80::3c9c:30ff:fe9f:b137 icmp_seq=4 Destination unreachable: Address unreachable
    [5] => 
    [6] => --- fe80:0000:0000:0000:acf3:14ff:fe1d:bc7f ping statistics ---
    [7] => 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3016ms
    [8] => 
)