Type	Option Name	Reference
0	Reserved	[RFC5533]
1	I1 (first establishment message from the initiator)	[RFC5533]
2	R1 (first establishment message from the responder)	[RFC5533]
3	I2 (2nd establishment message from the initiator)	[RFC5533]
4	R2 (2nd establishment message from the responder)	[RFC5533]
5	R1bis (Reply to reference to non-existent context)	[RFC5533]
6	I2bis (Reply to a R1bis message)	[RFC5533]
7-59	Unassigned
60-63	Reserved for Experimental Use	[RFC5533]
64	Update Request	[RFC5533]
65	Update Acknowledgement	[RFC5533]
66	Keepalive	[RFC5533]
67	Probe Message	[RFC5533]
68	Error Message	[RFC5533]
69-123	Unassigned
124-127	Reserved for Experimental Use	[RFC5533]

Type Value	Message	Reference
0	Reserved	[RFC5533]
1	Responder Validator	[RFC5533]
2	Locator List	[RFC5533]
3	Locator Preferences	[RFC5533]
4	CGA Parameter Data Structure	[RFC5533]
5	CGA Signature	[RFC5533]
6	ULID Pair	[RFC5533]
7	Forked Instance Identifier	[RFC5533]
8-9	Unassigned
10	Keepalive Timeout Option	[RFC5533]
11-16383	Unassigned
16384-32767	Reserved for Experimental Use	[RFC5533]

Code Value	Description	Reference
0	Unknown Shim6 message type	[RFC5533]
1	Critical Option not recognized	[RFC5533]
2	Locator verification method failed	[RFC5533]
3	Locator List Generation number out of sync	[RFC5533]
4	Error in the number of locators	[RFC5533]
5-119	Unassigned
120-127	Reserved for debugging purposes	[RFC5533]

Shim6 Parameters

Shim6 Types