interface re0 {
  # Request two step DCHP exchange instead of the usual four step method
  send rapid-commit;

  # Request DNS servers
  request domain-name-servers;

  # Request an Identity Association for Non-temporary Addresses (IA-NA)
  send ia-na 1;

  # Request an Identity Association for Prefix Delegation (IA-PD)
  send ia-pd 1;
};

id-assoc pd 1 {
  # This is the largest prefix you can request from Comcast (16 subnets)
  # prefix ::/60 infinity;

  prefix-interface em0 {
    # Defines the subnet id. For Comcast it could be 0 through f.
    sla-id 0;

    # Defines smallest IPv6 prefix size (/64) minus the prefix size the ISP
    # assigns us. For Comcast it could be up to four (/64 - /60)
    sla-len 0;

    # In WIDE-DHCP this would assign a specific IPv6 address to em1
    # i.e. [prefix][sla][ifid]
    ifid 1;
  };

};

id-assoc na 1 {
};