Song,
it is certainly true that proximity is often used in DHTs, but not, as
far as I know, for the assignment of node IDs. It is used, for
example, to select among many possible candidate nodes for inclusion
in the routing table. But, as others have already said, the randomness
of note IDs is important for the security and robustness of a DHT. You
can have efficient routing without giving up the randomness of note ID
assignment. See, for example, Pastry. http://www.freepastry.org/pubs.htm
Bruce Davie
On Dec 2, 2008, at 10:11 AM, songhaibin 64081 wrote:
Hi Ekr,
It's not clear to me why it's desirable for nodes which are
geographically close to be close in the overlay topology.y
-Ekr
P2P networks are teemed with dynamic nodes. When a peer leaves the
overlay, it will transfer the stored resource records to a node
which has a close node ID. From the perspective of an ISP's network,
making P2PSIP node IDs with proximity property will reduce the
network hops when data transfer happens.
Besides that, I think overlay maintenance messages will also take
less network hops if most neighbors have close node IDs. If node ID
has proximity property, it will help for the peer selection when
there are a list of peers providing the same resource.
I think we can find some papers describing the proximity for DHTs. I
agree with Bruce that there are many considerations when assigning
node id.
Best Regards,
Song Haibin
At Tue, 02 Dec 2008 14:26:56 +0100,
Xianghan Zheng wrote:
[1 <text/plain; ISO-8859-1 (7bit)>]
Hello,
Is someone considering the mapping between the P2PSIP ID and
physical
location. I think it is necessary to think about it although it
is not
trivial and might cause some security problem.
In the draft
"http://www.p2psip.org/drafts/draft-licanhuang-p2psip-
subsetresourcelocation-00.txt",
However, the peer ID is formed as domain name. Is that conflict
with the
concept that the ID should 128/160 bit integer? Is it possible
that
each peer in one domain assigned similar identity? Any
suggestions?
Thank you.
Best Regards,
Xianghan Zheng
[2 xianghan_zheng.vcf <text/x-vcard; utf-8 (base64)>]
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fn:Xianghan Zheng
n:Zheng;Xianghan
org:;Information and Communication Technology
adr:;;;Grimstad;;4879;Grimstad
title:PHD Studnet
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tel;cell:+47 91664693
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