Few steps for migrating 2003 to 2008

After completing the forestprep check the schema version and wait for the completeing the replication and then run the domainprep.

How to check the schema version.
http://support.microsoft.com/kb/556086
Schema version for new operation system
Find the Schema version for the operating systems
13 - Windows 2000 Server30 - Windows Server 2003 RTM, Windows 2003 With Service Pack 1, Windows 2003 With Service Pack 231 -Windows Server 2003 R244 - Windows Server 2008 RTM47 - Windows Server 2008 R2
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Take the system state backup of your schema master then disable the outbound replication and run the forestprep.
Repadmin /options +DISABLE_OUTBOUND_REPL
After getting the success log enable the out bound replication via repadmin.
Repadmin /options -DISABLE_OUTBOUND_REPL
Wait for competing the replication.
Pls see the link also.
http://social.technet.microsoft.com/wiki/contents/articles/migrating-active-directory-domain-controller-from-windows-server-2003-to-windows-server-2008.aspx

Known Issues for AD DS Backup and Recovery

http://technet.microsoft.com/en-us/library/cc771139(WS.10).aspx

Windows 2008 Active Directory Operations Guide

http://www.microsoft.com/downloads/en/confirmation.aspx?FamilyID=291BDDB7-EDC6-4E6D-9852-A9A14991D67C

You no need to press F8 for logging into DSRM mode for 2008

Enable DSRM Login
bcdedit /set safeboot dsrepair
shutdown -t 0 -r

Disable DSRM login
bcdedit /deletevalue safeboot
shutdown -t 0 –r

First_dc_in_domain_problem

I have found one problem in 2008 (not sure about R2).
below link is for 2003 but I have resolved the same issue on 2008 with the help of below link.
http://www.petri.co.il/first_dc_in_domain_problem.htm

Difference between forwarder and Stub zone

Both the zones are used for name resolution but when we are used stub and when we are used forwarder. I am trying to say as small as possible.
Ex: We need a trust between domain A and domain B and am a system admin of domain A and in future any changes happen in domain B, we may not get those update , here best is stub, why? Because stub is automated process and the changes will update automatically.
Forwarder is a manual process. Assume admin of domain B has changed the DNS server but I don’t have the update, here problem comes-up.

If you are aware of the activity of domain B then you can use the forwarder.

N.B: You can not create stub zone and forwarder together with the same zone name.

How to dump all scopes of a DHCP server?

You have to login into a DHCP server.
Go to run and type cmd
c:>netsh dhcp server \\Dhcpservername show scope dump