[Devel] Re: strict isolation of net interfaces

Serge E. Hallyn serue at us.ibm.com
Fri Jun 30 09:14:42 PDT 2006

Quoting Eric W. Biederman (ebiederm at xmission.com):
> This whole debate on network devices show up in multiple network namespaces
> is just silly.  The only reason for wanting that appears to be better management.

A damned good reason.  Clearly we want the parent namespace to be able
to control what the child can do.  So whatever interface a child gets,
the parent should be able to somehow address.  Simple iptables rules
controlling traffic between it's own netdevice and the one it hands it's
children seem a good option.

> We have deeper issues like can we do a reasonable implementation without a
> network device showing up in multiple namespaces.

Isn't that the same issue?

> If we can get layer 2 level isolation working without measurable overhead
> with one namespace per device it may be worth revisiting things.  Until
> then it is a side issue at best.

Ok, and in the meantime we can all use the network part of the bsdjail
lsm?  :)


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