Eric W. Biederman [off-list ref] wrote:

quoted

As an example, I could set up a client machine with two ethernet ports,
set up two DNS+NFS servers, each of which think they're called "foo.bar"
and attach each server to a different port on the client machine.  Then I
could create a pair of containers on the client machine and route the
network in each container to a different port.  Now there's a problem
because the names of the cached DNS records for each port overlap.

Please look at ip netns add.

	warthog>man ip | grep setns
	warthog1>

It does solve this in userspace rather simply.

Ummm...  How?  The kernel DNS resolver is not namespace aware.

David
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