1 / 18

IPv6 Addressing

IPv6 Addressing. Local-Use Unicast Addresses. Link-local addresses Used between on-link neighbors and for Neighbor Discovery Site-local addresses Used between nodes in the same site. Link-Local Addresses. Format Prefix 1111 1110 10 FE80::/64 prefix Used for local link only

gavivi
Download Presentation

IPv6 Addressing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. IPv6 Addressing

  2. Local-Use Unicast Addresses • Link-local addresses • Used between on-link neighbors and for Neighbor Discovery • Site-local addresses • Used between nodes in the same site

  3. Link-Local Addresses • Format Prefix 1111 1110 10 • FE80::/64 prefix • Used for local link only • Single subnet, no router • Address autoconfiguration • Neighbor Discovery 10 bits 54 bits 64 bits 1111 1110 10 000 . . . 000 Interface ID

  4. Site-Local Addresses • Format Prefix 1111 1110 11 • FEC0::/48 prefix for site • Used for local site only • Replacement for IPv4 private addresses • Intranets not connected to the Internet • Routers do not forward site-local traffic outside the site 10 bits 38 bits 16 bits 64 bits 1111 1110 11 000 . . . 000 Subnet ID Interface ID

  5. Special IPv6 Addresses • Unspecified address • 0:0:0:0:0:0:0:0 or :: • Loopback address • 0:0:0:0:0:0:0:1 or ::1

  6. Multicast IPv6 Addresses • Flags • Scope • Defined multicast addresses • All-Nodes addresses • FF01::1 (Node Local), FF02::1 (Link Local) • All-Routers addresses • FF01::2 (Node Local), FF02::2 (Link Local), FF05::2 (Site Local) 8 bits 4 bits 4 bits 112 bits 1111 1111 Flags Scope Group ID

  7. Solicited-Node Address 64 bits 64 bits • Example: • For FE80::2AA:FF:FE28:9C5A, the corresponding solicited-node address is FF02::1:FF28:9C5A • Acts as a pseudo-unicast address for very efficient address resolution Unicast prefix Interface ID 24 bits FF02: 0:0:0:0 :1:FF

  8. IPv6 Addresses for a Host • Unicast addresses: • A link-local address for each interface • Unicast addresses for each interface (site-local or global addresses) • A loopback address (::1) • Multicast addresses: • The node-local scope all-nodes multicast address (FF01::1) • The link-local scope all-nodes multicast address (FF02::1) • The solicited-node address for each unicast address • The multicast addresses of joined groups

  9. IPv6 Addresses for a Router • Unicast addresses: • A link-local address for each interface • Unicast addresses for each interface • Loopback address (::1) • Anycast addresses • Subnet-router anycast address • Additional anycast addresses (optional) • Multicast addresses: • The node-local scope all-nodes multicast address (FF01::1) • The node-local scope all-routers multicast address (FF01::2) • The link-local scope all-nodes multicast address (FF02::1) • The link-local scope all-routers multicast address (FF02::2) • The site-local scope all-routers multicast address (FF05::2) • The solicited-node address for each unicast address • The multicast addresses of joined groups

  10. IPv6 Interface Identifiers • The last 64 bits of unicast IPv6 addresses • Interface identifier based on: • Extended Unique Identifier (EUI)-64 address • Either assigned to a network adapter card or derived from IEEE 802 addresses • Temporarily assigned, randomly generated value that changes over time • A value assigned by a stateful address configuration protocol (DHCP) • A value assigned during a Point-to-Point Protocol connection establishment • A manually configured value

  11. IEEE 802 Addresses • Company ID • Extension ID • U/L bit (u) • Universally (=0)/Locally (=1) Administered • U/G bit (g) • Unicast (=0)/Group (=1) Address 24 bits 24 bits ccccccug cccccccc cccccccc xxxxxxxx xxxxxxxx xxxxxxxx IEEE-administered company ID Manufacturer-selected extension ID

  12. 24 bits 40 bits ccccccug cccccccc cccccccc xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx IEEE-administered company ID Manufacturer-selected extension ID IEEE EUI-64 Addresses • Extended Unique Identifier • Company ID • Extension ID

  13. Conversion of an IEEE 802 Address to an EUI-64 Address IEEE-administered company ID Manufacturer-selected extension ID 24 bits 24 bits ccccccug cccccccc cccccccc xxxxxxxx xxxxxxxx xxxxxxxx IEEE 802 Address ccccccug cccccccc cccccccc 11111111 11111110 xxxxxxxx xxxxxxxx xxxxxxxx 0xFF 0xFE EUI-64 Address

  14. Conversion of an EUI-64 Address to an IPv6 Interface ID EUI-64 Address ccccccug cccccccc cccccccc xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx Complement the universally/locally administered (U/L) bit ccccccUg cccccccc cccccccc xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx IPv6 Interface Identifier

  15. Conversion of an IEEE 802 Address to an IPv6 Interface ID IEEE-administered company ID Manufacturer-selected extension ID 24 bits 24 bits cccccc00 cccccccc cccccccc xxxxxxxx xxxxxxxx xxxxxxxx IEEE 802 Address EUI-64 Address cccccc00 cccccccc cccccccc 11111111 11111110 xxxxxxxx xxxxxxxx xxxxxxxx 0xFF 0xFE cccccc10 cccccccc cccccccc 11111111 11111110 xxxxxxxx xxxxxxxx xxxxxxxx IPv6 Interface Identifier 64 bits

  16. IEEE 802 Address Conversion Example • Host A has the MAC address of 00-AA-00-3F-2A-1C • 1. Convert to EUI-64 format • 00-AA-00-FF-FE-3F-2A-1C • 2. Complement the U/L bit • The first byte in binary form is 00000000. When the seventh bit is complemented, it becomes 00000010 (0x02). • Result is 02-AA-00-FF-FE-3F-2A-1C • 3. Convert to colon hexadecimal notation • 2AA:FF:FE3F:2A1C • Link-local address (FE80::/64) for node with the MAC address of 00-AA-00-3F-2A-1C is FE80::2AA:FF:FE3F:2A1C.

  17. Mapping IPv6 Multicast Addresses to Ethernet Multicast Addresses IPv6 Multicast Address 8 16 24 32 FF...: Ethernet Multicast Address 33-33-

  18. IPv4 Addresses and IPv6 Equivalents IPv4 Address IPv6 Address Internet address classes N/A Multicast addresses (224.0.0.0/4) IPv6 multicast addresses (FF00::/8) Broadcast addresses N/A Unspecified address is 0.0.0.0 Unspecified address is :: Loopback address is 127.0.0.1 Loopback address is ::1 Public IP addresses Aggregatable global unicast addresses Private IP addresses Site-local addresses (FEC0::/48) APIPA addresses Link-local addresses (FE80::/64) Dotted decimal notation Colon hexadecimal format Subnet mask or prefix length Prefix length notation only

More Related