Mini Brain Dump: IP Subnet Change Considerations

I’ve been sitting on this post for a long time, and intended to write a more detailed description.

Here are some things you may need to consider (outside of the obvious like DHCP scopes, DNS server settings, Firewall settings & rules, etc) when changing the IP range your Windows network operates on:

  • TCP/IP Printer ports on print server
  • Printer/Copier IP/DNS/SMTP settings
  • Exchange allowed relay ranges
  • Any copy/print accounting devices attached to copiers
  • Monitoring host settings. Eg. Big Brother/Hobbit – Both client and server side, if not configured to use DNS in config files
  • Server iLO IP addresses

Some steps for changing domain controller IP addresses. Do these first before any other important servers:

  1. Change IP
  2. ipconfig /flushdns
  3. ipconfig /registerdns
  4. Either restart the Netlogon service, or run ‘nltest /dsregdns’
  5. Reboot

Disclaimer: This is by no means a complete list. Use these directions at your own risk.

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