netdev - Re: [PATCH v2] bonding: send IPv6 neighbor advertisement on failover

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Date:	Fri, 10 Oct 2008 09:56:12 -0700
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Vlad Yasevich <vladislav.yasevich@...com>
Cc:	Brian Haley <brian.haley@...com>, Jay Vosburgh <fubar@...ibm.com>,
	David Stevens <dlstevens@...ibm.com>,
	Alex Sidorenko <alexandre.sidorenko@...com>,
	David Miller <davem@...emloft.net>,
	Simon Horman <horms@...ge.net.au>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	netdev-owner@...r.kernel.org,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH v2] bonding: send IPv6 neighbor advertisement on
	failover


On Fri, 2008-10-10 at 12:29 -0400, Vlad Yasevich wrote:
> Brian Haley wrote:
> > Jay Vosburgh wrote:
> >>     As a semi-related question, what does IPv6 do if it receives a
> >> gratutitous NA, and finds a duplicate?

I think Jay was asking about the case where the target address in the NA 
matches the address of the receiving interface. The RFCs don't describe
how to handle such a case and leave it to the implementation. Linux logs
a warning message and ignores such NA.

Thanks
Sridhar

> > 
> > If a node has an IPv6 neighbor entry and receives an unsolicited NA it
> > will change it's state to stale, forcing a re-lookup on the next
> > transmit.  An un-solicited NA will change the state to reachable.
>                 ^^^^^^^^^^^^
> 
> You probably meant to say "solicited".  Unsolicited NAs can only change
> the state to STALE.
> 
> Also, the re-lookup will happen on a delay after the transmit.
> 
> -vlad


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