(sorry for multiple copies, if any)

> Well, one of the nice features about RELOAD, IMHO, is that very
> little explicit support for clients is needed. Basically, a client
> is a node which connects to other nodes but does not issue JOINs
> or UPDATEs. Therefore:

For scenarios where a node initially joins as a client and later decides [upon 
inviation from another peer] to upgrade itself to a peer, it will need a 
mechanism to obtain the routing table of its connected peer. In such a 
scenario, a client needs to issue an UPDATE.

A client may also like to maintain connections with multiple peers incase the 
peer it is connected to goes offline. Thus, it needs to send an UPDATE to 
obtain a list of backup peers from its connected peers. If a client connects to 
multiple peers, does it need to advertise multiple destination lists?


> - The peers it is explicitly connected to can route to it
>  directly.
> - It is in their neighbor table but not their route table so
>  it never routes packets.
> - Because it doesn't JOIN it never stores data.
> 
> 
> Note that a client can connect to peers at one of two places:
> 
> - At the location indicated by its peer-id.
> - At a random location.
> 
> In the first case, routing to the clients peer-id simpyly works,
> since it goes through the node responsible through that space,
> which is directly connected to the client. In the second case,
> the client can advertise a destination list [this is one use
> for this feature] consisting of the peer it is connected to
> and then itself.

As I mentioned earlier, if a client connects to N peers to mitigate against 
peer churn, it will need to advertise N destination lists similar to a 
multihomed router advertising N routes. This increases the state/message 
complexity.

Further, routing by destination lists breaks during churn.

-s

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