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Re: Performance impact of linking libwrap



Florian Weimer wrote:
> * Michael Ströder:
> 
>> Hmm, I will drop it since the same functionality can be easily achieved on
>> this platform by using local kernel firewall.
> 
> The DNS-based access rules are not available as part of the kernel
> firewall.

Good point.

> For some odd reasons, a lot of people think this
> tcpwrappers feature is insecure,

Me too. ;-)

> but it seems a rather convenient way
> to get *additional* security in cases where you have proper reverse
> lookup (with matching forward lookup) and fragmented address space
> that does not lend itself easily to writing access rules.

But it adds two additional DNS lookups to the game.

> But as I said, this goes against accepted wisdom, so these additional
> filters probably don't make it through security audits, and carrying
> along this support at the tool level does not make much sense anymore:
> 
> <https://lists.fedoraproject.org/pipermail/devel/2014-March/196913.html>

Thanks for the link to this interesting discussion.

Ciao, Michael.

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