[Users] Re: [Devel] Loadbalancing using Path-HF with NAT-Support

[Bogdan-Andrei Iancu]

Hi Andreas,

look pretty cool this feature :)...

I will overview the patch that need to be applied on register module and 
if so, I will commit it. then feel free to upload the module on CVS.

regarding the natping stuff....I will try to brainstorm a little bit to 
find some built-in solutions....for the moment:
    1) if use OPTIONS ping, we can use path to route the ping via the 
balancer as OBP
    2) a light usrloc on OBP just for natping purposes....
    3) open for suggestions...

regards,
bodgan


Andreas Granig wrote:

> Hi,
>
> I've uploaded a new module "path" to the tracker on sourceforge, which 
> allows a intermediate proxy (an openser instance working as 
> loadbalancer) to add it's URI into a Path-HF in various ways:
>
> - add_path(): Adds URI including the address of the outgoing interface 
> as Path-HF in the form of "Path: <sip:1.2.3.4:5060>"
>
> - add_path_received(): like the above, but adds a parameter 
> "received=sip:2.3.4.5:1234" to the URI to pass the received-address of 
> an UAC to a registrar
>
> - both of the above functions also allow to pass a userpart for the 
> Path-URI, so add_path("loadbalancer") results in a Path-HF "Path: 
> <sip:loadbalancer at 1.2.3.4:5060>"
>
> - If the module parameter "use_received" is set to 1, the module hooks 
> into rr-processsing and sets the "received"-parameter of a Route-URI 
> as destination-uri if available. This is used in combination with 
> add_path_received(), where subsequent requests are sent to the 
> received-address of the initial registration (aka the URI given in the 
> received-parameter of the Path-HF).
>
>
> Also included is a patch to the registrar module, which allows to 
> store the URI in the received-parameter of the first Path-HF as 
> received-value of usrloc and set the NAT flag for this contact. This 
> feature can be enabled by setting the parameter "path_use_received" of 
> the registrar module to 1.
> One should be aware that nat-pinging of such a contact isn't supported 
> by nathelper/mediaproxy yet, but the values are in place (since I use 
> an external application for nat-pinging).
>
> Some feedback is very much appreciated.
>
> Cheers,
> Andy
>
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