Proper use of "allow/deny unknown-clients"?

John Miller johnmill at
Tue Aug 20 18:19:24 UTC 2013

On Tue, Aug 20, 2013 at 1:57 PM, Chris Buxton <clists at>wrote:

> On Aug 20, 2013, at 10:54 AM, John Miller <johnmill at> wrote:
> > We're running into a seemingly odd issue:  when we specify "allow
> unknown-clients" within one of our address pools, known clients are no
> longer to obtain IP addresses.  When we remove the allow/deny rule
> altogether, there's no problem with either known or unknown clients
> connecting.
> If you set an "allow" rule, anything not allowed is implicitly denied.
> If you set a "deny" rule, anything not denied is implicitly allowed.

Ahh... that makes sense.  I'd been making the assumption that since giving
no allow/deny directive allowed everything, that an explicit allow rule
wouldn't change that behavior.  Sounds like this is not the case.

Appreciate the help, Chris.

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