Windows 7 Prefix Policy Quirks

[James Small]

Hello,

 

I'm trying to implement consistent client prefix policies and also adhere to
RFC 6724.  Windows 8/8.1 come this way by default.  However, Windows Vista/7
follow the older RFC 3484 rules.  To update Windows Vista/7 I came up with a
simple script.  The issue is, I can't get Windows 7 to take the policy for
the deprecated site-local prefix (fec0::/10):

 

netsh int ipv6 add prefixpolicy fec0::/10 1 11

 

netsh int ipv6 show pre

(.)

         1     11  fe00::/10

 

>From experimentation, it seems to ignore anything after the first 8 bits.
The only way I can get it to accept fec0 is if I enter "fec0::/16" which
obviously isn't what I want.  It's almost like the prefix policies have to
be a multiple of 8 bits.

 

I could have sworn this worked before but for the life of me I can't get it
to work now.  I had a few other people try it to see if I'm doing something
silly but same results.  Has anyone else run into this?  Any suggestions?

 

Thanks,

  --Jim

 

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