Created
November 15, 2017 14:06
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| ## AMT Relay discovery ## | |
| * Need anycast address of AMT Relay (233.44.15.9) | |
| * AMT gateway sends AMT Relay Discovery message to anycast address (233.44.15.9) | |
| * Find closest relay using routing table | |
| * Send message to UDP port 2268 and has Nonce | |
| * Relay responds to Gateway with AMT Relay Advertisement message | |
| * Gateway receives message with Relay's unique IP address. | |
| * Gateway uses this IP address for any AMT messages (AMT Requests/AMT Membership updates) sent to this specific Relay | |
| * Relay replies using UDP Port 2268 and contains the same Nonce that the Gateway verifies is the same, | |
| so it knows that the reply is a reply to its Discovery message. | |
| * When Gateway receives this AMT Relay Advertisement Message, the Gateway starts 3-way handshake. | |
| * Gateway sends AMT Request message to Relay using the relay's unique IP address as the destination (along with new Nonce) | |
| * Relay replies with AMT Query with a new Nonce from AMT request and a code (MAC) in further messages from Gateway. | |
| * AMT query encapsulates IGMP membership query and includes Querier's Query Interval Code (QQIC) which specifies Query Interval used by querier | |
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