RFC 2461 Neighbor Discovery for IPv6 December 1998 4.6. Option Formats...................................... 28 4.6.1. Source/Target Link-layer Address............... 28 4.6.2. Prefix Information............................. 29 4.6.3. Redirected Header.............................. 31 4.6.4. MTU............................................ 32 5. CONCEPTUAL MODEL OF A HOST............................... 33 5.1. Conceptual Data Structures.......................... 33 5.2. Conceptual Sending Algorithm........................ 35 5.3. Garbage Collection and Timeout Requirements......... 37 6. ROUTER AND PREFIX DISCOVERY.............................. 37 6.1. Message Validation.................................. 38 6.1.1. Validation of Router Solicitation Messages..... 38 6.1.2. Validation of Router Advertisement Messages.... 39 6.2. Router Specification................................ 40 6.2.1. Router Configuration Variables................. 40 6.2.2. Becoming An Advertising Interface.............. 44 6.2.3. Router Advertisement Message Content........... 44 6.2.4. Sending Unsolicited Router Advertisements...... 46 6.2.5. Ceasing To Be An Advertising Interface......... 46 6.2.6. Processing Router Solicitations................ 47 6.2.7. Router Advertisement Consistency............... 48 6.2.8. Link-local Address Change...................... 49 6.3. Host Specification.................................. 50 6.3.1. Host Configuration Variables................... 50 6.3.2. Host Variables................................. 50 6.3.3. Interface Initialization....................... 51 6.3.4. Processing Received Router Advertisements...... 51 6.3.5. Timing out Prefixes and Default Routers........ 54 6.3.6. Default Router Selection....................... 54 6.3.7. Sending Router Solicitations................... 55 7. ADDRESS RESOLUTION AND NEIGHBOR UNREACHABILITY DETECTION. 56 7.1. Message Validation.................................. 57 7.1.1. Validation of Neighbor Solicitations........... 57 7.1.2. Validation of Neighbor Advertisements.......... 58 7.2. Address Resolution.................................. 58 7.2.1. Interface Initialization....................... 59 7.2.2. Sending Neighbor Solicitations................. 59 7.2.3. Receipt of Neighbor Solicitations.............. 60 7.2.4. Sending Solicited Neighbor Advertisements...... 61 7.2.5. Receipt of Neighbor Advertisements............. 62 7.2.6. Sending Unsolicited Neighbor Advertisements.... 64 7.2.7. Anycast Neighbor Advertisements................ 65 7.2.8. Proxy Neighbor Advertisements.................. 65 7.3. Neighbor Unreachability Detection................... 66 7.3.1. Reachability Confirmation...................... 66 7.3.2. Neighbor Cache Entry States.................... 67 7.3.3. Node Behavior.................................. 68 8. REDIRECT FUNCTION........................................ 70 Narten, et. al. Standards Track