Re: [Sipping] UA indentification and HIP

[Jonathan Rosenberg <[e-mail]>]

Thanks for the brief intro, Gonzalo. I need to read more on HIP and its 
on my now-very-length reading list for the plane.

Let me anyway ask the main question I have not understood, which is how 
address resolution is done. So, lets say I want to send a message to a 
host, and I have obtained its HIT somehow. Presumably I need to 
translate that to the IP for the host. How is that done? If its DNS, 
then what is the difference between HIP and just using dynamic DNS and 
assigning a hostname to each host?

Or, is the proposal that a HIT is an address, not a name, in which case 
routes to it are injected into the IP routing infrastructure. I hope, 
and assume, that this is not the case, since thats equivalent to a host 
route for every host on the Internet... egads!

-Jonathan R.

Gonzalo Camarillo wrote:

> Folks,
> 
> the following two drafts describe how to indentify a particular UA using 
> globally unique identifiers:
> 
> http://www.ietf.org/internet-drafts/draft-stucker-sip-guid-00.txt
> http://www.ietf.org/internet-drafts/draft-jennings-sipping-instance-id-00.txt 
> 
> 
> Cullen pointed out that this work may be able to take advantage of the 
> work carried out in the HIP (Host Identity Protocol) WG, which 
> supplemental web page is:
> 
> http://hip.piuha.net/
> 
> Here you have a *very* brief introduction to HIP. I will also be 
> providing a brief introduction to the drafts above to the HIP community. 
> Hopefully, we will have a useful exchange of ideas between both WGs.
> 
> HIP consists of a layer between the network and the tranport layers 
> (e.g., between IP and TCP). It uses HIs (Host Identifiers) to identify 
> hosts. The idea is that, when a host changes its IP address, it keeps 
> its HI. This facilitates mobility, for instance.
> 
> HIs (Host Identifiers) are public keys, which may have different lengths 
> and formats. To resolve this, HIP defines the HITs (Host Identity Tags), 
> which are hashes of the HI. That is, a HIT is a hash of a public key. 
> They are 128 bit long, and can be used instead of IPv6 addresses in 
> socket calls. HIP also defines LSIs (Local Scope Indetifiers), that are 
> 32 bit long and can be used instead of IPv4 addresses in socket calls.
> 
> Regards,
> 
> Gonzalo
> 
> 
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-- 
Jonathan D. Rosenberg, Ph.D.                600 Lanidex Plaza
Chief Technology Officer                    Parsippany, NJ 07054-2711
dynamicsoft
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