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From: Bryan Drewery <bdrewery@FreeBSD.org>
Subject: r288951: ifconfig -alias, arp not removed
Organization: FreeBSD
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Date: Thu, 29 Oct 2015 09:25:03 -0700
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# ifconfig
igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500

options=403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO>
        ether c8:0a:a9:04:39:78
        inet 10.10.0.7 netmask 0xffff0000 broadcast 10.10.255.255
        inet 10.10.7.2 netmask 0xffff0000 broadcast 10.10.255.255
        inet 10.10.0.9 netmask 0xffff0000 broadcast 10.10.255.255
        nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active

# ifconfig igb0 inet 10.10.0.9 -alias
# arp -an|grep 10.10.0.9
? (10.10.0.9) at c8:0a:a9:04:39:78 on igb0 permanent [ethernet]
# arp -d 10.10.0.9
arp: writing to routing socket: Operation not permitted

I swear this is not normal. I'm on an older build as well, r288951.

-- 
Regards,
Bryan Drewery