[yocto] iMX6 FEC driver Linux-fslc 4.17 - IPV6 Multicast not working when unplugging/plugging ethernet cable

[Stefano Cappa]

Hi everyone,

if I boot my device with ethernet cable attached and I execute "ping6
ff02::fb" to ping the multicast address I get this response:
*root at evk:~# ping6 ff02::fb*
*PING ff02::fb (ff02::fb): 56 data bytes*
*64 bytes from fe80::c2f:eff:fe11:2d71: seq=0 ttl=64 time=2.057 ms*
*64 bytes from fe80::809:1bfb:8d4c:ae54: seq=0 ttl=64 time=73.101 ms (DUP!)*
*64 bytes from fe80::3e28:6dff:feed:5b97: seq=0 ttl=64 time=150.772 ms
(DUP!)*

Otherwise, If I unplug and plug again ethernet cable, I cannot ping the
multicast ipv6 address anymore.
The result is:
*root at evk:~# ping6 ff02::fb*
*PING ff02::fb (ff02::fb): 56 data bytes*
*ping6: sendto: Network is unreachable*

It seems an issue in Linux FEC driver, as already explained here
https://community.nxp.com/thread/359397.
I commented that issue to report the problem with linux 4.9.88, but the
same happens also with fslc kernel 4.17 Sumo branch.

Do you have any suggestions? This is really a frustrating and I'm really
surprised to see the same problem also on Linux 4.17.

Thank u.
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