netdev - Re: [PATCH v2] add stealth mode

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Date:	Tue, 07 Jul 2015 10:07:53 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Matteo Croce <matteo@...nwrt.org>, Valdis.Kletnieks@...edu
Cc:	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] add stealth mode



On Mon, Jul 6, 2015, at 21:44, Matteo Croce wrote:
> 2015-07-06 12:49 GMT+02:00  <Valdis.Kletnieks@...edu>:
> > On Thu, 02 Jul 2015 10:56:01 +0200, Matteo Croce said:
> >> Add option to disable any reply not related to a listening socket,
> >> like RST/ACK for TCP and ICMP Port-Unreachable for UDP.
> >> Also disables ICMP replies to echo request and timestamp.
> >> The stealth mode can be enabled selectively for a single interface.
> >
> > A few notes.....
> >
> > 1) Do you have an actual use case where an iptables '-j DROP' isn't usable?
> 
> If you mean using a default DROP policy and allowing only the traffic
> do you want,
> then the use case is where the port can change at runtime and you may not
> want
> to update the firewall every time

Can't you use socket match in netfilter to accomplish exactly that?
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