Messages in this thread | | | From | Matteo Croce <> | Date | Wed, 23 Sep 2015 18:36:12 +0200 | Subject | Re: [PATCH v4] add stealth mode |
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2015-09-16 13:06 GMT+02:00 Florian Westphal <fw@strlen.de>: > > 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.
The point is to do the filtering without *tables at all, like /proc/sys/net/ipv4/icmp_echo_ignore_all does for pings
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