RADIUS attribute from rfc6572

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PMIP6-Visited-DHCP4-Server-Address

The PMIP6-Visited-DHCP4-Server-Address attribute (Type value 158) is
   of type Address and delivers the IPv4 address of the DHCPv4 server
   from the visited network to the MAG.  When both the MAG and the LMA
   are in the visited network, the VAAA MAY assign a DHCPv4 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 DHCPv4 server address
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     Visited DHCPv4 server address |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Type:
      PMIP6-Visited-DHCP4-Server-Address 158.

   Length:
      = 6 octets

   Visited DHCPv4 server address:
      This field is of type Address and contains a 4-octet IPv4 address
      of the DHCPv4 server.

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