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RE: [moonv6] /120 prefix length at UNH
From: Bound, Jim (jim.bound@hp.com)
Date: 10/15/03
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moonv6 post from "Bound, Jim" <jim.bound@hp.com>
Alain,
One or both of us need to go back to basic math course :--) (thats a joke sir...). comment below.
>
> >A /120 prefix does not say that n+m != 64. It simply states
> that the
> >high order bits of n == 8 and m == 58, which == 64 leaving 64 for
> >EUI-64.
> >
> >/120 prefix is not a violation of 3513.
> >
> Yes it is. Wich ever way you cut it, with /120, m+n == 120,
> and this by definition of the prefix length.
>
> RFC3513, section 2.3:
>
> prefix-length is a decimal value specifying how many of the
> leftmost contiguous bits of the address comprise
> the prefix.
>
With /120
m = 8. n == variable depending on prefix format. this is aggregatable format. so the prefix stops at /64 and low order 64 is the EUI. meaning n MUST not be greater than 58. 58 + 8 == 64. So what I am saying is I beleive /120 or /96 does not step on the EUI but a /8 does step on the EU and does break 3315?
So we are debating the formula now which is good and important.
thanks
/jim
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