[Dnsmasq-discuss] Add more dhcp log about finding dhcp-config failed

[renmingshuai]

Hi !
When dnsmasq attempts to search for the configured DHCPv6 address based on the MAC address, it will send NS packets to obtain the client MAC address. If dnsmasq fails to obtain the MAC address because any net reason, it cannot find the configured DHCPv6 address. As a result, the client cannot obtain the MAC address as expected. Adding some dhcp logs about finding dhcp-config failure will help users to find the cause more quickly.
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