netdev - Re: [PATCH v2] add stealth mode

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Message-ID: <21611.1436179798@turing-police.cc.vt.edu>
Date:	Mon, 06 Jul 2015 06:49:58 -0400
From:	Valdis.Kletnieks@...edu
To:	Matteo Croce <matteo@...nwrt.org>
Cc:	nicolas.dichtel@...nd.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] add stealth mode

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?

2) You *do* realize that this isn't anywhere near sufficient in order
to actually make your machine "invisible", right?  (Hint: What *other*
packets can be sent to a machine to provoke a response?)

3) At least my copy had massive whitespace damage, where all the tab characters
appear to have evaporated....

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