Re: [PATCH] IPv6: Implement RFC 4429 Optimistic Duplicate Address Detection

["YOSHIFUJI Hideaki / 吉藤英明" <yoshfuji@linux-ipv6.org>]

In article <20070208130715.GA27267@hmsreliant.homelinux.net> (at Thu, 8 Feb 2007 08:07:15 -0500), Neil Horman <nhorman@tuxdriver.com> says:

> > I still have a question.  Now, who will install the kernel route for
> > the incoming packet?  Can we get packet for our unicast address during
> > optimistic DAD period?
> > 
> Not sure what you're getting at here.  RFC 4429 makes no distinction between
> optimistic and non-optimistic packets for recevied frames, so routes for
> received packets will be added by the same code that does it currently (which I
> admittedly haven't looked into to closely).  Packets received for our unicast
> address (even if it is optimistic) are handled just as any other packet is (same
> as it is for TENTATIVE addresses, as I understand it). 

I think it is clear.

In tentative state, we do not receive any packet.
After finishind DAD process, we install kernel route for that address
in net/ipv6/addrconf.c:__ipv6_ifa_notify(), and we start receiving
packet for that address.

On the other hand, optimistic addresses are like in deprecated state.
So, we should be able to receive frames for those addresses.

--yoshfuji