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Gregg, Hello fellow Nebraska graduate . . . Your question is more complicated than you might expect, as some of the issues in following a moving hostname is at the Linux kernel level with the ARP table. Using the case where you have an LDM (spc.noaa.gov) that is feeding from another LDM with hostname xyz.noaa.gov, and that hostname gets moved to a new machine that has a different IP, at the very least, you would need to restart the LDM on spc.noaa.gov, but that may not be enough. The spc.noaa.gov kernel will be holding an ARP table entry from the original MAC from xyz.noaa.gov, and it will generally only reload that ARP table on the following conditions: - reboot of spc.noaa.gov - clear the ARP table on spc.noaa.gov, then restart LDM - wait until the scheduled time for the kernel on spc.noaa.gov to refresh the ARP table, and then restart LDM - send an unsolicited ARP update from the new server of xyz.noaa.gov to spc.noaa.gov, then restart LDM The LDM will get its host information from the OS, so the thrust of the restart will also need to insure the OS is understanding that there was an IP change. Let me know if that does not answer your question or explain what would be needed. - Stonie Cooper, PhD Software Engineer III NSF Unidata Program Center University Corporation for Atmospheric Research I acknowledge that the land I live and work on is the traditional territory of The Pawnee, The Omaha, and The Otoe. Ticket Details =================== Ticket ID: DOZ-458327 Department: Support LDM Priority: Critical Status: Open =================== NOTE: All email exchanges with NSF Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.