1. NAT traversal for HIP is described here:
http://www.ietf.org/internet-drafts/draft-ietf-hip-nat-traversal-04.txt
It basically uses ICE.

2. I understand NAT traversal for HIP that uses another approach, not ICE,
may be published shortly after testing with SIP VoIP over HIP.
See page 9 on http://www3.ietf.org/proceedings/08jul/slides/HIPRG-3.pdf
mentioning the testing without changes to SIP VoIP (due to NAT traversal).

Henry 


On 8/13/08 5:57 PM, "shidong chen" <[EMAIL PROTECTED]> wrote:

> Hi Henry,
> 
>> One approach to assure NAT traversal for all application protocols, including
>> various P2P overlays is using the Host Identity Protocol (HIP).
>> 
>> With such an approach, not all the media has to pass through VPN-like
>> servers.
>> A small number of bootstrap nodes that are not behind NAT can act as relays
>> for those nodes are behind "bad" NAT.
>  
> I briefly checked the HIP. It looks it enable one host to bind to different IP
> without interruption of sessions. It is not clear to me how it is related to
> NAT crossing issue. Did I miss any great point here? Could you explain how the
> idea works here?
> 
> Thanks
> 
> Shidong
> 
> 
> 
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