Migrating to Linux: Tip 1: Do DHCP and DNS firstFebruary 13, 2009 6:16 pm General
If, like most organisations, your client PCs get their IP addresses and DNS and routing information over DHCP, you can make your migration life easier by moving your DHCP server first, followed by your local nameserver.
Whenever you need to declare a server name or IP address for a service (mail, time, proxy, whatever), use a service-specific domain name: smtp.mycompany.office, imap.mycompany.office, ntp.mycompany.office and so on.
Since you control the DNS server, you can incrementally move these over to your Linux server and you only have to change the IP address once, in your central nameserver, rather than do the rounds of all the clients every time you switch a service, allowing a painless incremental approach to moving basic internet services which, if you do things right, people won’t even notice.
Next: the hard stuff: Exchange and Outlook.
Edit: Update .local to .office – .local is reserved for mDNS (thanks to my readers for spotting this!)