RADIUS attribute from rfc6572

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PMIP6-Visited-DHCP6-Server-Address

The PMIP6-Visited-DHCP6-Server-Address attribute (Type value 160) is
   of type IPv6 address and contains the IPv6 address of the DHCPv6
   server in the visited network indicated by the VAAA to the MAG that
   serves the MN.  When both MAG and the LMA are located in the visited
   network, the VAAA MAY assign a DHCPv6 server to the MAG in
   deployments where the MAG acts as a DHCP Relay, as defined in
   .0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |      Type     |   Length      | Visited DHCPv6 server address
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    Visited DHCPv6 server address
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    Visited DHCPv6 server address
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                    Visited DHCPv6 server address
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     Visited DHCPv6 server address |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type:
     PMIP6-Visited-DHCP6-Server-Address 160.

   Length:
      = 18 octets

   Visited DHCPv6 server address:
      This field is of type Address and contains the 16-octet IPv6
      address of the DHCPv6 server.

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