From: Flavio Leitner <fbl@redhat.com>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Subject: Re: [PATCH] route: add more relaxed option for secure_redirects
Date: Wed, 16 Nov 2011 21:17:38 -0200 [thread overview]
Message-ID: <20111116211738.067354c0@asterix.rh> (raw)
In-Reply-To: <20111116.170213.1763930566851730338.davem@davemloft.net>
On Wed, 16 Nov 2011 17:02:13 -0500 (EST)
David Miller <davem@davemloft.net> wrote:
> From: Flavio Leitner <fbl@redhat.com>
> Date: Wed, 16 Nov 2011 18:46:12 -0200
>
> > Thus, the only option at the sender side would be using iptables
> > to change the ICMP redirect source address to be the float address,
> > but that is not working as well. (It isn't passing through -t nat)
>
> If it's going to mangle the packet in one direct, the only option
> for sane operation is to make the exact reverse transformation in
> the other direction for ICMP messages.
>
> I'm sorry to be so difficult about this, but this is the only way to
> handle this problem. If packet mangling is performed to change the
> world, that mangling entity has taken on the responsibility to make
> everything look correct to all entities for the mangled packets
> and any packets generated in response to such mangled packets.
>
I'm sorry, I lost you there. There is no transformation happening in
any side. The iptables is just a work around to force the outgoing
ICMP redirect to use the correct source address (secondary or alias).
The whole problem is the linux gateway sending ICMP redirects using
*always* the primary address.
fbl
next prev parent reply other threads:[~2011-11-16 23:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-07 15:41 [PATCH] route: fix ICMP secure_redirects Flavio Leitner
2011-11-07 18:35 ` David Miller
2011-11-07 19:05 ` Flavio Leitner
2011-11-08 0:03 ` [PATCH] route: add more relaxed option for secure_redirects Flavio Leitner
2011-11-12 1:33 ` David Miller
2011-11-16 20:46 ` Flavio Leitner
2011-11-16 22:02 ` David Miller
2011-11-16 23:17 ` Flavio Leitner [this message]
2011-11-17 1:40 ` Flavio Leitner
2011-11-17 1:41 ` David Miller
2011-11-17 21:53 ` David Miller
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