On Mar 6, 2008, at 4:50 PM, Eric Rescorla wrote:

> At Thu, 6 Mar 2008 13:19:19 -0500 (EST),
> Salman Abdul Baset wrote:
>>
>>
>>>> -A node may join the overlay as a client. Later, it may be  
>>>> invited by a
>>>> peer to upgrade itself to the overlay. A client may also decide  
>>>> to upgrade
>>>> itself to a peer.
>>>>
>>>> -A node's attempt to join as a peer may be defered by a peer  
>>>> because
>>>> it has not been up for certain time. The peer can then ask the  
>>>> node to
>>>> join as a client.
>>>
>>> I don't see the point of either the peer refusing to let you join
>>> as a peer or asking you to join as one. The client knows its
>>> own properties better than the peer does and the peer has no
>>> special standing--it just happens to ahve a peer-id
>>> close that of the client.
>>
>> A peer may refuse to let a node join as a peer because a node is
>> considered 'abusive' by the admitting peer or does not meet desired
>> security properties.
>
> Actually, I think this is a really bad idea. There's no practical
> way to distinguish this from the admitting peer just being
> malicious.
>

That's probably true, but there's a pretty wide variety of algorithms  
(especially in those overlays that use superpeers) for deciding on  
promotion criteria, and I think the decision is made by existing  
members extending invitations in quite a few of those algorithms.  I  
don't think it's something we can/should prohibit at the peer  
protocol level.  Seems like it should be a decision of the DHT  
algorithm.

Bruce

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