A DHCPv6 server requires the user to implement a request handler. Basically the
user has to provide the logic to answer to each packet. The library offers a few
facilities to forge response packets, e.g. NewAdvertiseFromSolicit,
NewReplyFromDHCPv6Message and so on. Look at the source code to see what's
available.
An example server that will print (but not reply to) the client's request is shown in main.go