B-3 Discovering IPv6 with Wireshark - Sharkfest
B-3 Discovering IPv6 with Wireshark - Sharkfest B-3 Discovering IPv6 with Wireshark - Sharkfest
Address AutoconfigurationIPv6 Stateless Address Autoconfiguration (SLAAC)• If a router is present, host will also autoconfigure global address• Prefix will be obtained from router, example 2001:db8::/64• Interface ID is either derived from MAC address or a random value• Router indicates in advertisement if stateful configuration may be usedEthernet MAC address 00 : 30 : 64 : 6b : 85 : 32IPv6 address: EUI-64 format20 01 0d b8 00 00 00 00 02 30 64 ff fe 6b 85 32IPv6 address: privacy format20 01 0d b8 00 00 00 00 9c 4a e7 8a 20 38 d4 d1random value+© Leutert NetServices SHARKFEST ‘11 | Stanford University | June 13–16, 2011 4
Address AutoconfigurationSolicited Node Multicast Address (SNMA)• Probably the most strange part of IPv6 addressing• An IPv6 host forms a SNMA for each own unicast address in use• The SNMA address is used for Neighbor Discovery (replacement of ARP)• The SNMA address is derived from each unicast address in useHosts unicast address20 01 0d b8 00 00 00 00 02 30 64 ff fe 6b 85 32Hosts SNMA addressff 02 00 00 00 00 00 00 00 00 00 01 ff 6b 85 32SNMA prefix ff02:0:0:0:0:1:ff00/10424 bitsSNMA derived from unicast address: ff02::1:ff6b:8532© Leutert NetServices SHARKFEST ‘11 | Stanford University | June 13–16, 2011 5
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- Page 3: Address AutoconfigurationIPv6 State
- Page 7 and 8: IPv6 Interfaces• In Windows Vista
- Page 9 and 10: Agenda• Address Autoconfiguration
- Page 11 and 12: ICMPv6 MessagesErrorand ControlMess
- Page 13 and 14: Agenda• Address Autoconfiguration
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Address AutoconfigurationSolicited Node Multicast Address (SNMA)• Probably the most strange part of <strong>IPv6</strong> addressing• An <strong>IPv6</strong> host forms a SNMA for each own unicast address in use• The SNMA address is used for Neighbor Discovery (replacement of ARP)• The SNMA address is derived from each unicast address in useHosts unicast address20 01 0d b8 00 00 00 00 02 30 64 ff fe 6b 85 32Hosts SNMA addressff 02 00 00 00 00 00 00 00 00 00 01 ff 6b 85 32SNMA prefix ff02:0:0:0:0:1:ff00/10424 bitsSNMA derived from unicast address: ff02::1:ff6b:8532© Leutert NetServices SHARKFEST ‘11 | Stanford University | June 13–16, 2011 5
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