===== Forming a DHCP request for PPPoE-clients =====
===== Forming a DHCP request for PPPoE-clients =====
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For the [[en:dpi:bras_bng:bras_pppoe|PPPoE]]-subscribers, PCRF forms a DHCP-request with the following options that identify the subscriber:
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For [[en:dpi:bras_bng:bras_pppoe|PPPoE]] subscribers, PCRF generates a DHCP request with the following option identifying the subscriber:
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* opt61 Client-Id [[http://tools.ietf.org/html/rfc2132|RFC 2132]]- contains type "1" (ethernet) and the subscriber's MAC address in binary form;
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* **opt61 Client-Id** ([[http://tools.ietf.org/html/rfc2132|RFC 2132]]) — contains type "1" (ethernet) and the subscriber's MAC address in binary form.
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The option format when using the configuration parameter ''dhcp_client_id=1'' is as follows:
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<code bash>[comtype][subs_id][tunnel_ip]</code>
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<note tip>For PPPoE subscribers, the tunnel IP (''tunnel_ip'') is always 0.</note>
===== Forming Access-Accept =====
===== Forming Access-Accept =====
After receiving a response from the DHCP server, PCRF combines it with the ''Access-Accept'' previously received from the Radius. ''Access-Accept'' DHCP options can also be specified as [[en:dpi:bras_bng:bras_l2_vlan:bras_l2_vlan_dhcp:bras_l2_vlan_dhcp_proxy:bras_l2_vlan_dhcp_proxy_vsa|special VSA]]. When aggregating responses, the DHCP options returned by the DHCP server have a higher priority than these VSA-attributes; for example, if a different list of DNS servers is specified in both the DHCP response and the ''Access-Accept'', the subscriber will be sent a list of DNS servers from the DHCP server response.
After receiving a response from the DHCP server, PCRF combines it with the ''Access-Accept'' previously received from the Radius. ''Access-Accept'' DHCP options can also be specified as [[en:dpi:bras_bng:bras_l2_vlan:bras_l2_vlan_dhcp:bras_l2_vlan_dhcp_proxy:bras_l2_vlan_dhcp_proxy_vsa|special VSA]]. When aggregating responses, the DHCP options returned by the DHCP server have a higher priority than these VSA-attributes; for example, if a different list of DNS servers is specified in both the DHCP response and the ''Access-Accept'', the subscriber will be sent a list of DNS servers from the DHCP server response.
