Le 06/11/2019 à 21:08, Jen Linkova a écrit :
On Wed, Nov 6, 2019 at 6:19 PM Alexandre Petrescu
<alexandre.petrescu@xxxxxxxxx> wrote:
draft says:
Scaled Lifetime field SHOULD by default be set to the lesser of 3 x
MaxRtrAdvInterval divided by 8, or 8191
If MaxRtrAdvInterval is 1 (RFC6275 'Mobile IPv6', radvd.conf) then the
division wont work, so the 'lesser' wouldnt be computed.
We can add the following text: 'if 3 x MaxRtrAdvInterval is less than
8 then the Scaled Lifetime field SHOULD by default be set to 1',
On the side note: it looks to me that RFC6275 contradicts 'MUST' in RFC4861:
RFC6275: "Routers supporting mobility SHOULD be able to be configured
with a smaller MinRtrAdvInterval value and MaxRtrAdvInterval value....
MinRtrAdvInterval 0.03 seconds, MaxRtrAdvInterval 0.07 seconds"
while RFC4861 states that "MaxRtrAdvInterval ..MUST be no less than
4 seconds" and "MinRtrAdvInterval...MUST MUST be no less than 3
seconds").
At the same time RFC6275 is not formally updates RFC4861..
Then, by 'lifetime', in the cited text below and throughout the
document, one means the 'Scaled Lifetime' of this option, right?
It actually does not matter, as zero Scaled lifetime means zero
lifetime, and non-zero Scaled Lifetime means non-zero actual lifetime.
Routers SHOULD check and compare the following information:
o set of PREF64 with non-zero lifetime;
o set of PREF64 with zero lifetime.
Finally, for my curiosity, I wonder what kind of algorithm for checking
is consideredin each case. Is it a precise checking, or more relaxed?
For example, how does it compare a /96 to a /64 (with a precise checking
they cant match, but with a longest match checking they could); would an
absolute or a partial majority in the set be needed to win the check, etc.
2001:db8::/96 and 2001:db8::/64 are two different prefixes IMHO.
'Longest prefix match' etc applies when you are finding a prefix a
particular IP address belongs to, not when you compare two prefixes.
Ok.
And with respect to the question of how many members in a set must be
equal in order to declare consistency? All of them?
Alex
Also please note that it's just a check for configuration consistency
within a LAN/PvD.
Abstract
This document specifies a Neighbor Discovery option to be used in
Router Advertisements to communicate NAT64 prefixes to hosts.
The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-6man-ra-pref64/
IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-6man-ra-pref64/ballot/
No IPR declarations have been submitted directly on this I-D.
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