Date: Tue, 20 Aug 2002 11:29:40 +0300
From: Markku Savela <[EMAIL PROTECTED]>
Message-ID: <[EMAIL PROTECTED]>
| The delay is less suitable for DAD's done on RA. In optimized
| environment, addresses are useable immediately after RA.
That's true, but I'm not sure this is important.
| With
| non-optimized and delayed DAD, we would have undetermined gap after
| RA, when an address retrieved from DNS might not work.
If you're sticking things in the DNS simultaneously with RA, or even
before the RA is issued, then yes, I'd expect breakage. But I can't
imagine why anyone would do that.
Usually, I'd expect, you'd advertise the new prefix (via RA) then
after that's done, advertise the new addresses in the DNS - either
by manually waiting for the RA to take effect (which might involve
waiting a few RA transmit cycles - some hosts might be busy and
miss the first RA after all) and then editing the DNS, or by using
dynamic DNS, and having each host update its own address(es) as they
are installed in the host.
| I would like my
| network to be as deterministic as possible, avoid randomness when not
| absolutely necessary.
The way to achieve that is to test that the hosts have picked up the new
prefix before advertising it in the DNS, not by assuming that every host
will necessarily have the address available the instant that the RA is
transmitted.
kre
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