I changed the subject because I believe this is a separate issue.
>>>>> On Thu, 5 Feb 2004 17:40:44 -0800 (PST),
>>>>> Erik Nordmark <[EMAIL PROTECTED]> said:
>> This issue was originally posted by Ken Powell in February 2000:
>> I was able to force the preferred lifetime to zero by reconfiguring
>> a router to send advertisements with near-zero lifetimes, but the
>> valid lifetime couldn't be reduced below two hours.
> Question: did advertizing the prefix with both lifetimes = 0 not
> mean that the hosts stopped thinking that the prefix was on-link?
Ahh, another good catch. RFC2461 clearly says this point:
Stateless address autoconfiguration [ADDRCONF] may in some
circumstances increase the Valid Lifetime of a prefix or ignore it
completely in order to prevent a particular denial of service attack.
However, since the effect of the same denial of service targeted at
the on-link prefix list is not catastrophic (hosts would send packets
to a default router and receive a redirect rather than sending
packets directly to a neighbor) the Neighbor Discovery protocol does
not impose such a check on the prefix lifetime values.
(Section 6.3.4)
So, this is actually a non-issue. And, in fact, I've implemented the
prefix information processing this way, but I totally forgot it...
We may probably want to add a similar note in rfc2462bis, but my
current impression is that the note in RFC2461 is enough.
So, I'll basically do nothing on this.
Thanks,
JINMEI, Tatuya
Communication Platform Lab.
Corporate R&D Center, Toshiba Corp.
[EMAIL PROTECTED]
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