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Message-ID: <486554CC.8050609@zirakzigil.org>
Date: Fri, 27 Jun 2008 22:59:56 +0200
From: Giulio Ferro <auryn@zirakzigil.org>
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To: Peter Jeremy <peterjeremy@optushome.com.au>
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Cc: freebsd-net@freebsd.org
Subject: Re: SOLVED (was Re: Problem clarification (was: Problems with vlan
 + carp + alias))
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Peter Jeremy wrote:
> On 2008-Jun-26 22:06:11 +0200, Giulio Ferro <auryn@zirakzigil.org> wrote:
>   
>> I guess what I could do was to "poison" their arp cache for each
>> address with a "is-at" message. Is there a way to force the sending
>> of these messages for all the addresses of an interface?
>>     
>
> The kernel should send out gratuitous ARP requests whenever you assign
> an address to an interface.  You could confirm that this is happening
> by tcpdumping the interface whilst you add aliases.
>
> Rummaging around in ports, you might find net/arping or net/p5-Net-ARP
> useful if you want to manually generate gratuitous ARP requests.
>
>   
I have bad news for you all: this doesn't seem to happen for alias 
interfaces.
I've just tried to replicate what happened days ago. I've verified that 
only the
base (non alias) interface sends proper is-at messages. The aliases 
don't....

I could't either ping from one of those addresses or ping to one of them 
until
I isssued:
arping -S aliased-address router-address

The router didn't know the mac addresses had changed until then...

Can anyone confirm this?