Subscriber Services: RADIUS-sourced DHCPv4 & DHCPv6 Options for single & dual-stack sessions

The DHCPv4 option values are saved in the SDB_DHCP_OPTIONS session database (SDB) attribute. Likewise, for DHCPv6 subscribers, option values are saved in the SDB_DHCPV6_OPTIONS SDB attribute. However, for single-stack sessions (DHCP or DHCPv6), the DHCP option values for both IPv4 and IPv6 subscribers will be saved in SDB_DHCP_OPTIONS SDB attribute. For both single and dual-stack sessions, DHCPv4 header is saved in the SDB_DHCP_HEADER and DHCPv6 header in the SDB_DHCPV6_HEADER SDB attributes. The option values and header values received in DHCPv4 discover and DHCPv6 solicit messages are stored in respective SDBs and thus get populated in the new vendor specific attributes (VSAs). These VSAs are then sent to RADIUS server for authentication. The RADIUS server decodes the options, authenticates the client, and sends the RADIUS-sourced DHCP options back to the DHCP server. The DHCP server copies the RADIUS-sourced DHCP options, and also adds the DHCP server-sourced options to the packet and sends the response back to the client.