Version 6.11.0 of the LDM package has been released.
The main new feature of this minor release is the addition of a transitory database of information on local upstream LDM processes. The database is transitory because it only exists while an LDM server is running. The database is primarily used to determine whether or not an incoming data-request duplicates or otherwise overlaps with an existing data-request from the same downstream host. If it does, then the request will be rejected.
The motivation for this new feature is to prevent an accidental or deliberate denial-of-service (DOS) attack on an LDM server (an accidental DOS attack did occur at the Unidata Program Center -- causing some legitimate downstream sites to be denied data).
This release has a new utility, uldbutil(1), for listing the contents of the database. The LDM user can use this utility to easily determine what data they're getting from which upstream LDM-s. Naturally, this utility has a manual-page.
No similar database exists for downstream LDM processes because there is a one-to-one correspondence between such processes and the REQUEST entries in the LDM configuration-file, etc/ldmd.conf. If you want to know about locally-executing upstream LDM processes, then just grep(1) the LDM configuration-file (e.g., "grep -i ^request $HOME/etc/ldmd.conf").
Version 6.11.0 can be downloaded at http://www.unidata.ucar.edu/downloads/ldm/.