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IPv6 on the network

Neighbour discovery replacing ARP, stateless autoconfiguration and the EUI-64 identifier, DHCPv6, the IPv6 header, splitting a /48 and living alongside IPv4.

  • 29 cards
  • 5 topics
  • Free
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  1. Concepts
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  4. The numbers
  5. On the diagram

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  • IPv6: what is it?

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    The version of IP that codes addresses on 128 bits and whose fixed header is 40 bytes; addresses are written in hexadecimal, in 16-bit groups.

    A local network gets a 64-bit prefix, and the other 64 bits designate the interface. Routers no longer fragment packets: only the sender does.

  • The link's prefix is 2001:db8:1:1::/64 and the host's MAC address is 00:0c:29:7a:1f:3b. Which SLAAC EUI-64 address results?

    • 2001:db8:1:1:20c:29ff:fe7a:1f3b
    • 2001:db8:1:1:c:29ff:fe7a:1f3b
    • 2001:db8:1:1:20c:297a:1f3b:fffe
    • 2001:db8:1:1:10c:29ff:fe7a:1f3b
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    2001:db8:1:1:20c:29ff:fe7a:1f3b

    You insert ff:fe in the middle (29:ff:fe:7a) and flip the seventh bit of the first byte: 00 becomes 02. Forgetting the flip gives c, putting ff:fe at the end shifts everything, and flipping the last bit instead of the seventh gives 10c.

  • A host that wants a neighbour's MAC address sends a …; the neighbour answers with a ….

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    A host that wants a neighbour's MAC address sends a neighbour solicitation; the neighbour answers with a neighbour advertisement.

    These two ICMPv6 messages play the role of the ARP request and reply, but the solicitation goes to a multicast address specific to the sought neighbour.

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