dhcpd6-unnumbered

What is dhcpd6d-unnumbered?

• dhcpd6d-unnumbered is a stateless dhcpd6 server that looks at interface routes against an accepted prefix-filter and will handout dhcpd6 replies with the requested information.
• currently tested bootstrapping baremetal linodes using UEFI HTTP IPv6 but could be extended for other use cases.

How Does it Work?

• it listens on the dhcpd6 server multicast address on each interface
• the interface is checked against a regex. only matching interfaces are handled (default tap.*_0), not matching are ignored completely
• if the interfaces matches are regex
  • routes for that interface are looked up.
  • a route that matches our accept-prefix filter is handed out in the IA_NA option
• if a boot-url is requested we hand out a file depending on the user class
  • currently tested is using the UEFI IPv6 HTTP from there you can handout an ipxe.efi with embedded chain.
    • Sample (Must compile with IPv6 enabled):

      #!ipxe
      
      ifconf -c ipv6
      # chain http://[2600:3c02::f03c:93ff:fe60:1d33]/boot2.php?mac=${mac}&domain=${domain}&uuid=${uuid}&manufacturer=${manufacturer}&product=${product}&serial=${serial}
      chain --autofree http://boot.netboot.xyz
      boot
      

NOTES:

• Currently the server hands out ia_na non-temporary address, dns servers, domain-name, search domain, hostname. RA's are still needed for the default gw, set a nd-prefix in the accepted prefix range with the offlink flag set, managed-flag set, and other config flag set.

Usage:

dhcpd6-unnumbered -help

Example:

/dhcpd6d-unnumbered -regex "et1$" -accept-prefix "2000:1234::/64" -loglevel debug  -http-url "http://[2000:1234::1234]/ipxe.efi"

Build:

GOOS=LINUX go build