Command: ping6 -c 4 -I br-ffr fe80:0000:0000:0000:60e6:29ff:feb8:30af

Result:
Array
(
    [0] => PING fe80:0000:0000:0000:60e6:29ff:feb8:30af(fe80::60e6:29ff:feb8:30af) from fe80::649e:f0ff:feb4:30e0 br-ffr: 56 data bytes
    [1] => From fe80::649e:f0ff:feb4:30e0 icmp_seq=1 Destination unreachable: Address unreachable
    [2] => From fe80::649e:f0ff:feb4:30e0 icmp_seq=2 Destination unreachable: Address unreachable
    [3] => From fe80::649e:f0ff:feb4:30e0 icmp_seq=3 Destination unreachable: Address unreachable
    [4] => From fe80::649e:f0ff:feb4:30e0 icmp_seq=4 Destination unreachable: Address unreachable
    [5] => 
    [6] => --- fe80:0000:0000:0000:60e6:29ff:feb8:30af ping statistics ---
    [7] => 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3007ms
    [8] => 
)