From: Patrick McHardy <kaber@trash.net>
To: Changli Gao <xiaosuo@gmail.com>
Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>,
netfilter-devel@vger.kernel.org
Subject: Re: Add seperated timeout for the connections that only receive packets in one direction
Date: Mon, 30 Nov 2009 12:10:04 +0100 [thread overview]
Message-ID: <4B13A80C.6070607@trash.net> (raw)
In-Reply-To: <412e6f7f0911292039v74b89b4cieca5e2a043bad43d@mail.gmail.com>
Changli Gao wrote:
> On Fri, Nov 27, 2009 at 7:47 PM, Patrick McHardy <kaber@trash.net> wrote:
>> They don't need to forward anything, conntrack handles the packet before
>> routing.
>>
>
> Think about this topologic:
>
> Attacker -> router1 -> router2 -> ... -> Linux Router -> Apache.
>
> the packets in the other direction won't be sent to the Linux Router,
> as the other routers will routed them to the other place.
Yes, in that case it could help.
> Case 2:
>
> Attacker ---+
> +-- Linux Router --> WAN
> Victim-------+
>
> If we do sth. like RPF before entering conntrack, the packets in the
> other direction won't be in.
RPF doesn't help since its also done after conntrack.
next prev parent reply other threads:[~2009-11-30 11:10 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-27 9:09 Add seperated timeout for the connections that only receive packets in one direction Changli Gao
2009-11-27 9:25 ` Jozsef Kadlecsik
2009-11-27 9:32 ` Changli Gao
2009-11-27 9:42 ` Jozsef Kadlecsik
2009-11-27 9:59 ` Changli Gao
2009-11-27 10:02 ` Patrick McHardy
2009-11-27 11:47 ` Patrick McHardy
2009-11-30 4:39 ` Changli Gao
2009-11-30 11:10 ` Patrick McHardy [this message]
2009-12-01 1:26 ` Changli Gao
2009-12-01 9:14 ` Jozsef Kadlecsik
2009-12-01 9:29 ` Changli Gao
2009-12-01 9:45 ` Jozsef Kadlecsik
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