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kern/50127: ndp(8): temp option doesn't work

>Number:         50127
>Category:       kern
>Synopsis:       ndp(8): temp option doesn't work
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 05 08:30:01 +0000 2015
>Originator:     Ryota Ozaki
>Release:        current
NetBSD rangeley 7.99.20 NetBSD 7.99.20 (RANGELEY) #10: Tue Jul 28 09:45:16 JST 2015  ozaki-r@(hidden) amd64
ndp.8 says that, with temp option, we can insert an non-permanent NDP entry to the kernel.
However, it doesn't work. It seems that ndp correctly passes an expire value (> 0)
to the kernel, but the kernel ignores it.
# ndp -s fc00::101 52:54:00:bb:18:01 temp
# ndp -n fc00::101
Neighbor                             Linklayer Address  Netif Expire    S Flags
fc00::101                            52:54:00:bb:18:01    wm0 permanent R 

The "Expire" column shouldn't be "permanent".

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