Changing IP Address of All Servers

[Anthony Yates]

Due to a corporate change and because we plan to join a WAN in the
future we need to change all the IP addresses of our servers,
switches, clients etc.
All our client machines use a DHCP provided address between
10.0.0.100-10.0.0.255 and all our servers and other static IP address
devices have a address between 10.0.0.1-10.0.0.30.

The addresses will be changing to something like the following:-

10.6.1.1 - 10.6.1.255: Servers
10.6.2.1 - 10.6.2.255: Switches/Routers
10.6.3.1 - 10.6.3.255: Printers
10.6.4.1 - 10.6.4.255: Client Computers

For some strange reason the subnet is currently set to 255.0.0.0 but
this will be changed to 255.255.0.0 in the future.

Our servers are all Win2000, 3 are AD/DC, 2 DNS, 1 WINS, 1 DHCP.
One of the servers is Exchange 2000, 1 ISA, 2 SQL 2000, 1 TS.

What are keys things to be aware of when making such a change?
Is there a correct order or process for this type of change?

Any guide on this would be appreciated.

Regards,

Anthony

 

[Reni Ninan]

All your IP addresses are Class A and default subnet mask is 255.0.0.0. The
255.255.0.0 you have mentioned is the default subnet mask for Class B.

 

[Reni Ninan]

The different classes are:

Class A - 0-127

Class B - 128-191

Class C - 192 - 223

Class D - 224 - 240 (multicast -more on this later)

Class E - 240+ (experimental address space)


Also, 10.0.0.0 -10.255.255.255 (10/8 prefix) is a Class A Address
Allocation for Private Internets reserved by IANA (please see rfc 1918)

Default subnet masks are:

Class A default subnet mask = 255.0.0.0

Class B default subnet mask = 255.255.0.0

Class C default subnet mask = 255.255.255.0

 

[Jim Hungerford]

Speaking from the client side, Your Win2000 and XP clients will need to have
a IPCONFIG /FLUSHDNS done on them following the configuration of the new IP
scheme. This may not be necessary for all 2000 and XP PCs, but I'd add it
to your scripting for a while to make sure the new DNS scheme gets cached
for your servers and printers.

--
Regards,

Jim Hungerford, A+, MCP
http://www.screenshotmovies.com
Screenshot FLASH movies for Technical Support

 

[Anthony Yates]

Thank-you for your comments.
My main concern is what happens when I change the server IP addresses
and will everything still communicate, will Active Directory still
work etc?
For example: -
1) If I change my Exchange Server IP Address then I'll need to change
the publising rule in ISA.
2) If I change the DNS servers IP Address then I'll need to change the
IP Address DNS listens on.
3) If I change the subnet mask I'll need to delete and recreate the
DHCP scope as it can not be adjusted.