linux-kernel - Re: [patch -mm] net namespace: empty framework

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Date:	Wed, 22 Nov 2006 10:53:57 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Cedric Le Goater <clg@...ibm.com>
Cc:	Daniel Lezcano <dlezcano@...ibm.com>, Kirill Korotaev <dev@...ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Dmitry Mishin <dim@...ru>,
	netdev@...r.kernel.org
Subject: Re: [patch -mm] net namespace: empty framework

Cedric Le Goater <clg@...ibm.com> writes:

>> no problem here, but I think we will need another one,
>> or some smart way to do the network isolation (layer 3)
>> for the network namespace (as alternative to the layer 2
>> approach) ...
>
> My feeling (Dmitry and Daniel can correct me) is that it will be
> addressed with an unshare-like flag : NETNS2 and NETNS3.
>  
>> as they are both complementary in some way, I'm not sure
>> a single space will suffice ...
>
> hmm, so you think there could be a 2 differents namespaces
> for network to handle layer 2 or 3. Couldn't that be just a sub part
> of net_namespace.

The justification is performance and a little on the simplicity side.

My personal feel is still that layer 3 is something easier done
as a new kind of table in an iptables type infrastructure.  And in
fact I believe if done that way would capture do what 90%+ of what
all of the iptables rules do.  So it might be a nice firewalling speed up.

I don't think the layer 3 idea where you just do bind filter fits
the namespace concept very well.

Eric
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