[Engine-devel] SPICE IP override

[Yaniv Kaul]

On 11/07/2012 10:52 AM, Simon Grinberg wrote:
>
> ----- Original Message -----
>> From: "Michal Skrivanek" <michal.skrivanek at redhat.com>
>> To: engine-devel at ovirt.org
>> Sent: Tuesday, November 6, 2012 10:39:58 PM
>> Subject: [Engine-devel] SPICE IP override
>>
>> Hi all,
>> On behalf of Tomas - please check out the proposal for enhancing our
>> SPICE integration to allow to return a custom IP/FQDN instead of the
>> host IP address.
>> http://wiki.ovirt.org/wiki/Features/Display_Address_Override
>> All comments are welcome...
> My 2 cents,
>
> This works under the assumption that all the users are either outside of the organization or inside.
> But think of some of the following scenarios based on a topology where users in the main office are inside the corporate network while users on remote offices / WAN are on a detached different network on the other side of the NAT / public firewall :
>
> With current 'per host override' proposal:
> 1. Admin from the main office won't be able to access the VM console
> 2. No Mixed environment, meaning that you have to have designated clusters for remote offices users vs main office users - otherwise connectivity to the console is determined based on scheduler decision, or may break by live migration.
> 3. Based on #2, If I'm a user travelling between offices I'll have to ask the admin to turn off my VM and move it to internal cluster before I can reconnect
>
> My suggestion is to covert this to 'alternative' IP/FQDN sending the spice client both internal fqdn/ip and the alternative. The spice client should detect which is available of the two and auto-connect.
>
> This requires enhancement of the spice client, but still solves all the issues raised above (actually it solves about 90% of the use cases I've heard about in the past).
>
> Another alternative is for the engine to 'guess' or 'elect' which to use, alternative or main, based on the IP of the client - meaning admin provides the client ranges for providing internal host address vs alternative - but this is more complicated compared for the previous suggestion
>
> Thoughts?

Lets not re-invent the wheel. This problem has been pondered before and 
solved[1], for all scenarios:
internal clients connecting to internal resources;
internal clients connecting to external resources, without the need for 
any intermediate assistance
external clients connecting to internal resources, with the need for 
intermediate assistance.
VPN clients connecting to internal resources, with or without an 
internal IP.

Any other solution you'll try to come up with will bring you back to 
this standard, well known (along with its faults) method.

The browser client will use PAC to determine how to connect to the hosts 
and will deliver this to the client. It's also a good path towards real 
proxy support for Spice.
(Regardless, we still need to deal with the Spice protocol's migration 
command of course).


[1] http://en.wikipedia.org/wiki/Proxy_auto-config




>   
>
> Simon.
>
>> Thanks,
>> michal
>>
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