Compatibility with Previous LDM Versions

The LDM-6 system is backward-compatible with LDM-5. LDM-6 supports the full complement of LDM-5 protocol messages:

Therefore, an LDM-6 system can both send and receive data products from an LDM-5 system.

LDM-6 is not backward-compatible with LDM-4. The only LDM-4 message supported by LDM-6 is NULLPROC, which is used by the ldmping(1) utility of LDM-5.

If you make use of the maximum HEREIS size field in the LDM configuration-file, ldmd.conf, then the configuration-file will no longer be backward compatible with LDM-5.