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For a while now, passt disables ARP functionality completely if IPv4
is disabled. If qrap sends an ARP request as a probe in that case, it
will receive no answer and move on, trying to find another instance.
Add a second probe frame, a hardcoded neighbour solicitation, so that
we get a neighbour advertisement if IPv6 is enabled.
Without this change, IPv6-only operation is completely broken.
Reported-by: Wenli Quan <wquan@redhat.com>
Reported-by: Alona Paz <alkaplan@redhat.com>
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2106257
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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