Unremovable ARP entry and 'address already in use'

[Paul S.]

I just noticed that when obfuscating the IP, I added two dots.

Please excuse them, the IP is proper (110.62.211.87 for the purposes of 
this thread)

On 3/19/2015 午前 11:20, Paul S. wrote:
> Hi,
>
> Seeing this on 10.1-release p5.
>
> FreeBSD ipfw-0.syd.fqdn.tld 10.1-RELEASE-p5 FreeBSD 10.1-RELEASE-p5 #0 
> r278455: Mon Feb  9 07:18:21 UTC 2015 
> root at ipfw-0.syd.fqdn.tld:/usr/obj/usr/src/sys/qfkern  amd64
>
> Basically, I have a static arp entry that I cannot remove. This in 
> itself is not a problem. Problem is, when trying to assign that IP 
> address to the same interface, it says the 'address is in use' (which 
> it is not)
>
> ? (110.62..211.87) at 00:12:c0:88:03:8f on ix1 permanent [ethernet]
>
> Attempting to remove the entry produces an invalid argument error.
>
> root at ipfw-0:~ # arp -d 110.62..211.87
> arp: writing to routing socket: Invalid argument
>
> ix1 does not have this IP configured anymore either.
>
> ix1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         description: FW Upstream 0
> options=8400bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,VLAN_HWTSO> 
>
>         ether 00:12:c0:88:03:8f
>         inet6 fe80::212:c0ff:fe88:38f%ix1 prefixlen 64 scopeid 0x2
>         nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
>         media: Ethernet autoselect (10Gbase-LR <full-duplex>)
>         status: active
>
> When I try to assign it back to ix1, I get this
>
> root at ipfw-0:~ # ifconfig ix1 inet 110.62..211.87 netmask 255.255.254.0
> ifconfig: ioctl (SIOCAIFADDR): Address already in use
>
> I've verified with the provider that there isn't an arp entry at 
> present for this IP address, so the issue seems local to freebsd.
>
> Anyone ever see anything like this?
>
> I'm aware rebooting will fix it, but this is a live firewall and I'd 
> rather not do that.