Re: [libvirt] [PATCHv3 1/2] conf: add <listen> subelement to domain <graphics> element
On Wed, Jul 27, 2011 at 04:37:13PM +0100, Daniel P. Berrange wrote:
On Wed, Jul 27, 2011 at 11:20:42AM -0400, Laine Stump wrote:
One further thought, is should we even store 'port' on the listen
element. I know technically this lets you configure different
port numbers for different interfaces, but this feels somewhat
error prone for clients.
eg consider a guest A
<listen addr='10.0.0.1' port='5902'>
<listen addr='192.168.0.1' port='5909'>
and guest B
<listen addr='10.0.0.1' port='5904'>
<listen addr='192.168.0.1' port='5902'>
And DNS enter 'somehost.example.com' which has two A
records
somehost.example.com A 10.0.0.1
somehost.example.com A 192.168.0.1
Connecting to 'somehost.example.com' guest A you need to
be very careful not to accidentally get guest B.
It actually gets even worse if you consider a not uncommon
DMZ setup where each host is configured with addresses from
a private range like 10.0.0.x, but all users connect to the
machine using completely different a public IP address. In
such a case there'd be no way to reliably determine which
port to use for a guest when conencting to the public IP
if multiple different ports per VM allowed.
Daniel
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