If you set an IP to reserved and label it then becomes used (ping-able) the record is updated with the information for the current device and overwrites the reservation and comments. Then when the devices goes offline for a long period and is marked transient then available which removes the info you have put in. This seems to make it difficult to reserve blocks for stuff that comes and goes for long periods. I have the subnet properties set to update but not erase custom data. Any thoughts on resolving this? Would this we a common behavior?