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Groups > linux.kernel > #1225997

Re: [PATCH v4] add stealth mode

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Matteo Croce <matteo@openwrt.org> wrote:
> 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.

I think it would make more sense to extend the socket match
in xtables if it can't be used to achive this already.

seems like
*filter
:INPUT ACCEPT [0:0]
-A INPUT -p tcp -m socket --nowildcard -j ACCEPT
-A INPUT -p tcp -j DROP
COMMIT

Already does what you want for tcp, udp should work too.
I'd much rather see xtables and/or nftables to be extended
with whatever feature(s) are needed to configure such a policy
rather than pushing this into the core network stack.
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Re: [PATCH] [PATCH v3] add stealth mode David Miller <davem@davemloft.net> - 2015-09-15 21:10 +0200
  [PATCH v4] add stealth mode Matteo Croce <matteo@openwrt.org> - 2015-09-16 12:00 +0200
    Re: [PATCH v4] add stealth mode Daniel Borkmann <daniel@iogearbox.net> - 2015-09-16 12:30 +0200
      Re: [PATCH v4] add stealth mode Matteo Croce <matteo@openwrt.org> - 2015-09-16 12:50 +0200
        Re: [PATCH v4] add stealth mode Daniel Borkmann <daniel@iogearbox.net> - 2015-09-16 13:20 +0200
    Re: [PATCH v4] add stealth mode Florian Westphal <fw@strlen.de> - 2015-09-16 13:10 +0200
    Re: [PATCH v4] add stealth mode Eric Dumazet <eric.dumazet@gmail.com> - 2015-09-16 13:20 +0200

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