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According to an ipv6 dhcp log (Wireshark) example:

https://packetpushers.net/wp-content/uploads/2011/10/dhcpv6_2.jpg

We can see the client's ipv6 address already there before doing DHCP (S.A.R.R.)

because protocol allowed it ? just do a confirmation with DHCP server to keep the existed ipv6 address?

Mark
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  • when checking ipv4 dhcp behavior, we can see client ip is 0.0.0.0 first, but the ipv6 seems not, what's the difference ? – Mark May 12 '18 at 00:30
  • Every IPv6 interface will have a link-local address in the `fe80::/10` address range. IPv6 will normally have at least two addresses, the link-local address and a global address (in the `2000::/3` global address range). An interface can actually have multiple global addresses, and maybe one or more ULA addresses (in the `fc00::/7` address range), too. – Ron Maupin May 13 '18 at 23:15

1 Answers1

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IPv6 hosts may automatically generate IP addresses internally using stateless address autoconfiguration (SLAAC), or they may be assigned configuration data with DHCPv6.

https://en.wikipedia.org/wiki/DHCPv6

Mark
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