In the coming weeks, the production IP Address Management appliance grid will be refreshed with new appliances from the vendor.
Additionally, IPv6 addresses will be added to the grid management appliances and to the hostname ipam.illinois.edu used to access the GUI and API. The IPv4 address of the primary grid management appliance will also change.
Note that API clients should always use the hostname (ipam.illinois.edu) to avoid depending upon a particular IP address.
Detailed schedule:
- On Wed May 6 between 5:00-7:00 a.m., the secondary grid management appliance and one DNS appliance will be refreshed.
- On Tue May 19 between 5:00-7:00 a.m., one DHCP appliance and one DNS appliance will be refreshed.
- On Tue May 26 between 5:00-7:00 a.m., ipam.illinois.edu grid management will be switched over to the secondary (in AWS), the primary grid management appliance (on campus) will be refreshed, and ipam.illinois.edu will become reachable over IPv6.
- On Tue June 2 between 5:00-7:00 a.m., ipam.illinois.edu grid management will be switched back to the primary (on campus), and the remaining DHCP appliance and DNS appliance will be refreshed.
How will services be affected during the maintenance windows?
- During the maintenance window, IT Professionals will not be able to log in to Grid Manager (via the GUI or the API) to make DNS and DHCP configuration changes.
- Any Scheduled Tasks created in Grid Manager that have not completed before maintenance begins will be automatically removed.
- Due to the use of DHCP Failover, clients will in general still be able to obtain DHCP leases. However, if a particular DHCP Range is very nearly full and experiencing a lot of churn (old clients leaving and new clients joining the network) during the maintenance window, it is possible that some new clients joining that range may not be able to obtain leases until both servers are back online.
- DNS query resolution will not be impacted.
Please contact hostmgr with any questions or feedback.