On Mar 14, 2014, at 10:50 AM, Bob McDonald <bmcdonal...@gmail.com> wrote:

> I agree that TSIG or SIG(0) signed updates are certainly a more desirable 
> approach than allowing updates via address.  My DHCP server is setup to sign 
> all of it's updates this way.  However, I have AD domain controllers in the 
> environment that don't currently use signed updates.  Is there a fairly 
> painless way to convert all the AD machines to signed updates?

You would need to set up GSS-TSIG, which is not painless. (It's certainly 
doable, but there are plenty of pitfalls to overcome.) Windows doesn't support 
TSIG, just GSS-TSIG.

AFAIK, use of GSS-TSIG requires update-policy instead of allow-update on the 
master.

Regards,
Chris Buxton.
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