The DHCP relay process has been enhanced to record incoming DHCP discover and request messages. Because forwarding to the SAPs is done by the information in the subscriber management table and multiple SAPs are allowed in one interface it was impossible to know which SAP is used to forward the DHCP replies. The node maintains a cache of the DHCP requests. The cache can be viewed using the tools>dump>router>dhcp>group-if-mapping command. The cache holds an entry for 30 seconds. If an ACK/NAK packet was not received from the server within the timeout the node discards the cache entry. The node can use the Option 82 circuit-id field as part of the temporary host entry. If used, the ACK must contain the same circuit-id field in Option 82 to be found in the cache only if the match-circuit-id is specified at the DHCP level of the group- interface. When the match-circuit-id command is enabled a check is performed for option 82 circuit-id.