+-------------+           +-------------+             +-------+
|     CPE     |           |     NAS     |             |  AAA  |
|DHCPv4 Client|           |DHCPv4 Server|             |Server |
|             |           |RADIUS Client|             |       |
+------+------+           +------+------+             +---+---+
       |                         |                        |
       o------DHCPDISCOVER------>|                        |
       |                         o----Access-Request ---->|
       |                         |                        |
       |                         |<----Access-Accept------o
       |                         |     DHCPv4-Options     |
       |<-----DHCPOFFER----------o    (OPTION_V4_DNR)     |
       |     (OPTION_V4_DNR)     |                        |
       |                         |                        |
       o-----DHCPREQUEST-------->|                        |
       |     (OPTION_V4_DNR)     |                        |
       |                         |                        |
       |<-------DHCPACK----------o                        |
       |     (OPTION_V4_DNR)     |                        |
       |                         |                        |

               DHCPv4                      RADIUS