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Internet Protocol Version 6

Internet Protocol Version 6. Reading: Chapter 23. IPv6. Longer IP address 128 bits Simplified header format Extension headers Flow labeling Authentication and data protection. Address. 128 bits Colon separated hexadecimal FEDC:BA98:7654:3210:FEDC:BA98:7654:3210 F83:5::12

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Internet Protocol Version 6

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  1. Internet Protocol Version 6 Reading: Chapter 23 FSU CIS 5930 Internet Protocols

  2. IPv6 • Longer IP address • 128 bits • Simplified header format • Extension headers • Flow labeling • Authentication and data protection FSU CIS 5930 Internet Protocols

  3. Address • 128 bits • Colon separated hexadecimal • FEDC:BA98:7654:3210:FEDC:BA98:7654:3210 • F83:5::12 • Mixed IPv6 and IPv4 format • ::FFFF:129.13.64.5 • Some special address: • Unspecified, all 0 • Loopback: ::1 • Link-local addresses: FE80::x:x:x:x • Site-local addresses: FEA0::x:x:x:x FSU CIS 5930 Internet Protocols

  4. Packet header format (40 bytes) 0 3 11 15 31 23 Flow label Version Traffic class Hop limit Next header Payload length Source address Destination address FSU CIS 5930 Internet Protocols

  5. Packet header extensions • Hop-by-hop options • Routing packet header extension • Fragment packet header extension • Destination options • Authentication header • Encapsulating security payload FSU CIS 5930 Internet Protocols

  6. IPv6 implementation: incoming • ipv6_rcv() • Accepting packets from lower layer (DLL) • Some sanity checking • Processing extension headers if present • Passing on to ip6_rcv_finish() • ip6_input() • ip6_mc_input() • ip6_forward() FSU CIS 5930 Internet Protocols

  7. Forwarding packets • ip6_forward() • For packets need to be forwarded • If we can forward packets (router?) • Hop limit OK? • If not, drop packet, send ICMPv6 error message • If packet too big? • If so, dropping packet, sending ICMPv6 message • ip6_forward_finish() • ip6_output() FSU CIS 5930 Internet Protocols

  8. Packets delivered locally • ip6_input() • Passing on to ip6_input_finish() • Processing extension headers (ip6_parse_extheaders()) • Passing to higher protocols (TCP/UDP) FSU CIS 5930 Internet Protocols

  9. Transport layer packets • ip6_xmit(), ip6_output() • ip6_xmit() • Allocating extra header space if necessary • Setting header values • Passing to ip6_maybe_reroute() • Passing to ip6_output() FSU CIS 5930 Internet Protocols

  10. ip6_output() • Passing on to ip6_output_finish() • Figuring out next hop (Neighbor Discovery) • Passing to lower layer FSU CIS 5930 Internet Protocols

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