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Date:	Wed, 29 Nov 2006 15:21:00 -0500
From:	Brian Haley <>
To:	"Eric W. Biederman" <>
Cc:	Daniel Lezcano <>,,
	Dmitry Mishin <>,
	Stephen Hemminger <>,,
	Linux Containers <>,
	Herbert Poetzl <>
Subject: Re: Network virtualization/isolation

Eric W. Biederman wrote:
> I think for cases across network socket namespaces it should
> be a matter for the rules, to decide if the connection should
> happen and what error code to return if the connection does not
> happen.
> There is a potential in this to have an ambiguous case where two
> applications can be listening for connections on the same socket
> on the same port and both will allow the connection.  If that
> is the case I believe the proper definition is the first socket
> that we find that will accept the connection gets the connection.

Wouldn't you want to catch this at bind() and/or configuration time and 
fail?  Having overlapping namespaces/rules seems undesirable, since as 
Herbert said, can get you "unexpected behaviour".

> I think with the appropriate set of rules it provides what is needed
> for application migration.  I.e. can be filtered so that
> you can only connect to sockets in your current container.
> It does get a little odd because it does allow for the possibility
> that you can have multiple connected sockets with same source ip,
> source port, destination ip, destination port.  If the rules are
> setup appropriately.  I don't see that peculiarity being visible on
> the outside network so it shouldn't be a problem.

So if they're using the same protocol (eg TCP), how is it decided which 
one gets an incoming packet?  Maybe I'm missing something as I don't 
understand your inside/outside network reference - is that to the 
loopback address comment in the previous paragraph?


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