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What are all possible ways for peer discovery in a diameter node?

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What are all possible ways for peer discovery in a diameter node?
posted Sep 12, 2014 by Neelam

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answer Dec 27, 2014 by Saurabh Srivastava
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In one Diameter blog, I saw a statement in which mentioned, if a Diameter node receive CER from unknown peer it responds back to that peer with Result-Code AVP set to "DIAMETER_UNKNOWN_PEER".
Now my query, Does a Diameter node keep its potential peers information in advance ?

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I went through the following link:
http://diameter-protocol.blogspot.in/2011/03/diameter-peer-discovery.html

By going through the link, I came to know about two approaches to do peer discovery.
1. Selection Location Protocol (SLP)
2. DNS

I'm curious to know which one is the widely acceptable approach and on what basis acceptable option is better than the other one.

+1 vote

I went through an article of diameter, it mentions " Diameter standard advises that a diameter node to maintain two connection primary and secondary connection". Diameter node uses first connection in normal conditions and go for second one if primary connection is abrupted or not available. How far it is correct and where it is used exactly ?

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I know Diameter client can re-transmit the request message until it receives the answer message.
But what about when a Diameter node has sent answer message to the last received request from its peer and that's is not received but its peer. In this case, from Diameter client node transaction is not completed since it did not receive answer message but from other node point of view it has responded with answer and transaction is completed.

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