illumos gate

The DHCP address detection code only looks for the standard four-message DHCPv6 transaction, and only marks the start of the transaction when the client sends the Request message. Since the illumos dhcpagent program hardcodes the Rapid Commit option in the Solicit message (see section 22.14 of RFC3315), any cooperating server will send back an immediate Reply, forgoing the rest of the process, and skipping the Request message step.

This bug shows up when using software like dnsmasq, which will acknowledge Rapid Commit, but not with others, like ISC dhcpd, which will ignore the Rapid Commit option and send back an Advertise message.