Command: ping6 -c 4 -I br-ffr fe80:0000:0000:0000:12fe:edff:feaf:c1e0

Result:
Array
(
    [0] => PING fe80:0000:0000:0000:12fe:edff:feaf:c1e0(fe80::12fe:edff:feaf:c1e0) from fe80::649e:f0ff:feb4:30e0 br-ffr: 56 data bytes
    [1] => 64 bytes from fe80::12fe:edff:feaf:c1e0: icmp_seq=1 ttl=64 time=101 ms
    [2] => 64 bytes from fe80::12fe:edff:feaf:c1e0: icmp_seq=2 ttl=64 time=147 ms
    [3] => 64 bytes from fe80::12fe:edff:feaf:c1e0: icmp_seq=3 ttl=64 time=18.5 ms
    [4] => 64 bytes from fe80::12fe:edff:feaf:c1e0: icmp_seq=4 ttl=64 time=69.5 ms
    [5] => 
    [6] => --- fe80:0000:0000:0000:12fe:edff:feaf:c1e0 ping statistics ---
    [7] => 4 packets transmitted, 4 received, 0% packet loss, time 3004ms
    [8] => rtt min/avg/max/mdev = 18.588/84.231/147.421/46.927 ms
)