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From Justin Erenkrantz <>
Subject Re: [PATCH] Deny when reverse lookup fails
Date Sun, 06 Oct 2002 23:14:05 GMT
--On Friday, October 4, 2002 10:13 AM -0400 Joshua Slive <> 

> If I understand you correctly, that would be a major change to current
> behavior.  I believe that people expect a configuration like
> deny from
> to allow access from unknown IP addresses (IP addresses that have no
> reverse lookup).  Obviously, this is not at all secure, but that is how
> it has always been, and it is the way I would expect it to work.

Yes and no.  If I control and know that you're denying me based 
on that, I could remove the reverse mapping from my domain and then I can 
get in.  So, yes, host-based denial is insecure and has almost no hope of 
true success.

Perhaps we could create a config option that allows for double reverse 
failures on denials to proceed.  But, I think it is worth it to reevaluate 
what we're doing now...  -- justin

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