3.1.b (vi) DHCP Protocol Operations

DHCPv6 has some different protocol messages and sequences. here is the process of how a IPv6 host gets a DHCPv6 address from a Cisco router:

1. Client sends DHCPv6 Solicit
2. Router sends a DHCPv6 advertise
3. Client sends a DHCPv6 request
4. Router sends a DHCPv6 reply

These messages still go out as UDP, however the ports they use are different, they use (client) 546, (router) 547.

Here’s the original solicit message from client to all:

here’s the advertisement from the router to the client:

Here’s the request from the client to the router:

Here’s the final reply from the router to the client: