/* Author: Shirley Ma, xma@us.ibm.com */

DHCPv6 is a stateful address autoconfiguration protocol for IPv6, a
counterpart to IPv6 stateless address autoconfiguration protocol.  It can
either be used independently or it can coexist with its counterpart protocol.
This protocol uses client/server mode of operation but can also provide
support through a Relay Agent.  It is currently being defined by IETF DHC WG
and the specification is still in the draft form.

This protocol is intended to support on IPv6 based networks only.  For
specific details of the protocol, refer to the draft specification available
at IETF.

The ultimate goal of this project is to provide a protocol conformant
implementation for Linux.  The current implementation will slowly evolve to
support per the current draft and ultimately to the proposed standard when
it comes out of IETF.

Current Implementation status:

This implementation supports IPv6 address assignment to the clients.  It also
has the support for prefix delegation, DNS server updates but those features
are not validated yet.  The server also supports messages sent through relay
agents, both inbound and outbound.

The Linux implementation is based upon KAME's DHCPv6 implementation on BSD
which lacked the support for dynamic address assignment feature, now
supported in Linux.

A. Validated Features:

      IPv6 address Assignment & Prefix Delegation

       1. Server configuration file support for both static and dynamic
          assignments.
       2. Server lease file support for saving all the client's IPv6 address
          binding info.
       3. Client IPv6 address assignment and temporary IPv6 address assignment
          support on the same link.
       4. Supported Options:  Rapid commit, Server Preference, Information
          Request, Unicast, Elapsed Time, ClientID, ServerID, IA_NA, IA_TA,
          IA_ADDR, IA_PD, Status, Relay Message, Interface Identifier.
       5. Solicit/Request/Advertise/Reply/Infomation-request
          messages/Renew/Rebind/Release/Confirm/ messages support for IPv6
          address binding.
       8. Client configuration file support for IPv6 address assignment.
       9. Client lease file support for saving individual client ipv6address
          binding info.
      10. DNS server update support according to
          draft-ietf-dhc-dhcpv6-opt-dnsconfig-03.txt.
      11. Prefix delegation support according to
          draft-ietf-dhc-dhcpv6-opt-prefix-delegation-03.txt
      12. radvd.conf update and radvd reload for prefix delegation

B. Support available but not validated yet

      1. Request option support
      2. Relay-Forw/Relay-Repl messages and Relay Message Option

C. ToDo List:

      1. Authentication/User class/Vendor class/Interface-ID option
         support
      2. Reconfig message support.

D. INSTALLATTION/DEVELOPMENT:

      1. tar -xvzf dhcpv6-VERSION.tar.gz
      2. ./configure [options]
      3. make && make install
      4. insmod ipv6 (if ipv6 is not compiled in the kernel)
      5. mkdir /var/db/dhcpv6 (create dhcpv6 database directory)
      6. edit /etc/dhcp6c.conf (copy client configuration file from source)
      7. edit /etc/dhcp6s.conf (copy server configuration file from source)
      8. ./dhcp6s -dDf [eth0 eth1 ...] (start server, turn on debug)
      9. ./dhcp6c -dDf eth0 (start client, turn on debug)