incomplete+permanent arp entries

[Vitaliy Ovsyannikov]

Hello, freebsd-net.

  I've noticed what it is possible to make incomplete+permanent
entries in kernel arp table.

xx# arp -s 1.2.3.4 pub
arp: invalid Ethernet address 'pub'

# arp 1.2.3.4
1.2.3.4 (1.2.3.4) at (incomplete) on vlan1 permanent [vlan]

In result of it's permanent entry, kernel doesn't listening for
arp-replies for this host.

My question is simple: is it bug or feature?

-- 
Sincerely,
Vitaliy Ovsyannikov
JSC Skala, Krasnoyarsk, Russia