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Re: NFS boot fails with ip_output.c rev 1.261 Re: NFS boot fails with ip_output.c rev 1.261
On 2016-09-17 03:31, Robert Elz wrote:
Date: Fri, 16 Sep 2016 23:37:40 +0100
From: Roy Marples <roy%marples.name@localhost>
| > The IN_IFF_TENTATIVE handling just breaks lots of old code.
| You can disable it by setting the appropriate sysctl to zero.
| $ sysctl -a | grep dad
| net.inet.ip.dad_count = 3
| net.inet6.ip6.dad_count = 1
That isn't disabling the IFF_TENTATIVE handling, it is dosabling DAD,
is a different thing entirely.
The end result should be the same.
As I understand it, the reason for the change in 1.261 was to prevent
from invalid addresses (which is a good thing) - but tentative
not invalid, they just have not been proved valid yet, which is a
thing entirely. 99.9% (or more) of all tentative addresses are valid,
will remain valid, and there's no good reason not to send from them
more, it is require that we do so in the case that the same address is
claimed by 2 nodes at the same time - both are performing DAD together,
order for DAD to work properly - the ARP/ND requests must be answered.)
I think I would drop the assumption that tentative addresses are
and just allow sending from them. But if that isn't done, then UDP
be treated the same as TCP, and packets just "lost" rather than
a transmit error.
When I first proposed it offlist, we thought the current implementation
was the correct thing.
Here is a patch to just do as you suggest.
Can the OP test it and see if NFS booting then works?
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