[Bug 51680] New: nsi:nsi test_ip_neighbour() fails on unreachable link local entry

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51680

Bug ID: 51680
           Summary: nsi:nsi test_ip_neighbour() fails on unreachable link
                    local entry
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]

nsi:nsi has a failure on cw-rx460 from Windows 1709 to 21H1:

nsi.c:680: Test failed: AF_INET: 0 vs 1

https://test.winehq.org/data/patterns.html#nsi:nsi

The failing test has been introduced by the commit below and failed from the
start:

commit c09c65f65c188a1870d279ca793c5ad1fc15440d
Author:     Huw Davies 
AuthorDate: Tue Aug 10 09:20:47 2021 +0100

nsiproxy: Implement IPv4 neighbour enumerate_all.

Signed-off-by: Huw Davies 
    Signed-off-by: Alexandre Julliard

Adding some traces shows that the failure happens on a link local entry:
  AF_INET: 5 InterfaceIndex=10 state=0/0 s_addr=169.254.169.254

I have not identified the corresponding network interface. Also, given that
cw-rx460 ad cw-gtx560 are very similar I would expect both to have this issue
and I don't know why that's not the case.

However what is interesting is that in both cases the state is NlnsUnreachable
so I suspect the is_unreachable / IsUnreachable flags are not necessarily
meaningful.