Re: [P2PSIP] New draft: HIP BONE

Hi, Bruce,

From: "Bruce Lowekamp" <lowekamp@sipeerior.com>

> On Jan 10, 2008 3:17 AM, Pekka Nikander <pekka.nikander@nomadiclab.com> 
> wrote:
>> Hi Bruce,
>>
>> > The hip routing table approach looks great from a layering
>> > perspective, but implementation looks to be very hard.
>>
>> Why?  Do you allude that the various overlay routing protocols are
>> sufficiently different from the IP routing protocols so that one
>> cannot compute a forwarding table?  Or is there some other
>> implementation problem that you are thinking about?
>
> The issue I'm concerned about here is that different DHTs use
> completely different routing algorithms.  For example, for Chord you
> forward the message to the peer with the closest ID that is < the
> target, but with Kademlia, you do a prefix match and calculate
> distances with xor.  I'm sure it's possible to come up with a safe
> language or something that could be used to describe how to make
> routing decisions, but it's certainly non-trivial.

This is my concern also, FWIW. I also think it's possible, and I also think 
it's non-trivial.

>> > So in the hip routing table approach, the I1 etc messages are
>> > routed via 5 using HIP to 10 and eventually a new direct connection
>> > is established.
>>
>> Well, depending on many factors, it may be only a subset of the HIP
>> base exchange messages that would be routed over the overlay (through
>> node 5); some of them (like perhaps R2) could perhaps be sent
>> directly, at least in some cases.  So, there is some flexibility
>> here, but at least I don't quite understand the situation in cases
>> where both 1 and 10 are behind NATs.
>
> As long as they are both reachable in the overlay, both peers behind
> nats isn't a problem as long as the ice message exchanges are carried
> over the overlay.

I'm not saying there is a chicken-and-egg problem, but I'm not sure that 
there isn't (yet).

Thanks,

Spencer 

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