The tmnxDhcpSvrUserDbUnknown notification is generated when the local DHCP server instance drops a DHCP message because a local user database with the name specified for this server instance could not be found. This notification is only generated for DHCP server instances with the value of tmnxDhcpServerCfgAddrType set to 'ipv4(1)'.
Sources for this description
Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community)Netdisco MIB archive copiesNokia networking MIB copies (LibreNMS/Observium Community)