[Bug 265857] qlnxe: no IPV6 pings between nodes on the same switch until an IPv4 address is set

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265857

--- Comment #17 from benoitc <benoitc@enki-multimedia.eu> ---
(In reply to Zhenlei Huang from comment #15)

So to give a better idea I have 4 machines plugged to this switch. 3 with a
qlnxe card (<PREFIX>::11, <PREFIX>::12, <PREFIX>::13) and one with a mellanox
card <PREFIX>::10 :

         |- ::11 machine A
         |- ::12 machine B
SWITCH --|- ::13 machine C
         |
         |- ::10 machine D


A, B, C can ping D on <PREFIX>::10, and D can ping A, B, C on their <PREFIX> .

A, B, C can't ping each others using the global <PREFIX>. >>>

A, B, C , D can ping each others using the local link IP `fe080::....`

A, B, C, D can be pinged from an external machine (outside of the switch) and
can ping other machines on internet using their <PREFIX> IP.


I don't understand why A, B, C can't ping each others on <PREFX>::{11,12,13}
while they can using the IPv6 local link `fe80::` and be reached from outside.
Any idea what could be the issue? Maybe an option to set. Using Linux this is
working perfectly and th eissue is not reproduced.

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