netdev - Re: [RFC PATCH net-next] ppp: Allow ppp device connected to an l2tp session to change of namespace

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Message-ID: <20131024155354.GQ2704@kvack.org>
Date:	Thu, 24 Oct 2013 11:53:54 -0400
From:	Benjamin LaHaise <bcrl@...ck.org>
To:	James Chapman <jchapman@...alix.com>
Cc:	François Cachereul <f.cachereul@...halink.fr>,
	Paul Mackerras <paulus@...ba.org>, netdev@...r.kernel.org,
	linux-ppp@...r.kernel.org
Subject: Re: [RFC PATCH net-next] ppp: Allow ppp device connected to an l2tp session to change of namespace

On Thu, Oct 24, 2013 at 04:43:42PM +0100, James Chapman wrote:
> I'm thinking about the implications of a skb in the net namespace of the
> ppp interface passing through a tunnel socket which is in another
> namespace. I think net namespaces are completely isolated.
> 
> To keep your ppp interfaces isolated from each other, have you
> considered using netfilter to prevent data being passed between ppp
> interfaces?

Using network namespaces for this is far more efficient.  We've already 
added support for doing this to other tunneling interfaces.  This approach 
also makes creating VPNs where there is re-use of the private address space 
between different customers far easier to implement.

		-ben
-- 
"Thought is the essence of where you are now."
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