CSAIL host registration policy

All devices on the CSAIL network must use registered IP addresses. An IP address is considered registered if there is a host name associated with it (PTR record) in the appropriate reverse mapping zone of the DNS. Hosts using unregistered IP addresses may be removed from the network without warning or recourse. IP addresses on most CSAIL networks are assigned solely by WebDNS; DNS entries which TIG believes to be erroneous are liable to be removed at any time.

Note: Hosts using dynamic addresses do not need to be registered individually, provided that the dynamic pool has been registered. Addresses in a dynamic pool are not registered for specific machines, but for the DHCP server on that network; pool addresses may not be reassigned to individuals without the permission of the system administrators. If your host has a dynamic address and you wish to switch to a static address, you will have to change IP addresses.