Best practice to change IP?

Hi everyone,
I need to use VPN to connect to another network. The problem is that this network uses the same IP range as mine (10.0.1.x). I know that this is a problem and should be avoided, especially since the respective network's servers even have the same IP (10.0.1.3) and offer mostly the same services!
I'm willing to change one of the two networks to avoid conflicts. Both are similar in size and setup:
• NAT Router
• Leopard Server (10.5.6)
• Some Mac clients (mostly Leopard)
• A few network printers
Is it relatively painless to change an OS X Server's IP address? I've read some contrary things, where some are stating that you need to use the changeip command in Terminal. Others say it's sufficient to change it in Sys Prefs on the server followed by updating DNS.
It's no big deal to reconfigure the router, workstations and printers at one location. But what is the correct way to change the server's IP?
Here's the services I'm using at both locations:
• AFP
• DNS
• FTP
• iCal
• Open Directory
• Printing
• Web
Thanks a lot!
Björn

rkovelman wrote:
Yes otherwise you have to manually enter in everything. Also passwords will be lost, just select all users besides the admin and make a default password.
So this means using changeip kind of resets my OD database and even when doing a backup before the change and re-importing it I will lose all OD accounts' passwords?
You simply go to OD and after backing up you take it from master to standalone.
Ah, ok. I thought you were talking about the 3 kinds of setup you can choose when installing OS X Server. If you do not choose the Advanced Server there, you can only use the somewhat limited Server Preferences on your server and when you try to open Server Admin you get asked if you want to convert your server to Advanced. I thought you found a way of reversing this and couldn't imagine how on earth this could be possible.
• I'm really no newbie, but I'm slightly confused by IP range notation. (ie 10.X.0.0/8 and 10.Y.0.0/8)
Not sure what you mean and where you would use this... changeip does not need this.
I was asking because Steve Krawcke was suggesting to use completely separate IP ranges, which made me think of just what exactly I can use. I don't want to be in need of changing IPs again one day, so I want to get this right.
Can someone please take the time to correct (maybe by commenting?) my statements below if I'm wrong:
• There are only some IP ranges that can be used privately and are not routed on the internet. Since I'm using a NAT router that's fine and I should use one of them.
• Most home routers today come with a default IP of 192.168.x.1 and others (i.e. Apple AirPort Base Stations) use 10.0.1.1 as the default.
• I should avoid using these in my environments. Otherwise I'll get problems with VPN users when the same IPs have been used at both ends.
So if 10.0.0.0/8 = the range 10.0.0.0–10.255.255.255 does this mean I can freely use 10.123.0.1 as my router's IP and let's say 10.123.0.2 for the server and so forth? If so, can I still use a subnet mask of 255.255.255.0 or am I forced to choose something else? I really don't need more than max 50 IP addresses locally. But I'm confused, because in classful networks 10.0.0.0/8 meant a Class A network and I'm not sure I should use this?!
Thanks!
Björn

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