One domain and configure 2 DC for "fault tollerance"

I have one domain with 2 DC so configured:
DC1
Global Catalog ON
IP: 10.10.10.11
Subnet Mask: 255.255.255.0
Gateway: 10.10.10.1
DNS1: 10.10.10.11  
DNS2: 10.10.10.12

DC2
Global Catalog ON
IP: 10.10.10.12
Subnet Mask: 255.255.255.0
Gateway: 10.10.10.1
DNS1: 10.10.10.11  
DNS2: 10.10.10.12

1) Now the DNS information are correct?
2) If DC1 go down for a crash....DC2 take his place without problem? (for authentication)
3) Is necessary replicate FSMO.....for authentication and for the normal operation of DC?
4) Is different the situation A) where I shutdown DC1 and DC2 take his place B)There is a crash of DC1, DC2 take is place in the same mode?

Thanks a lot and sorry for all these questions
Ricky
diberiAsked:
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Steve KnightIT ConsultancyCommented:
DC2 dns should really be itself first then the other server IMHO.
Other than that as long as one DC is up authentication will work.
You probably don't need to worry about having GC's unless you are using other domains too.

If you are doing a controlled shutdown for a length of time of one DC that has the FMSO roles on it then transfer them to the other box first.

If a server crashes then you can seize the roles to the other with ntdsutil.

Have you considered redundant dhcp for your clients too?  I presume you are running dns on both dc's already with AD integrated zone.

To make redundant dhcp easiest way is to split your scope in two and setup on each server.  Plenty of Q's here on that if needed.

Quick answer as typing on little pda keyboard...

Steve
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diberiAuthor Commented:
Using this configuration some weeks ago...i have got troubles.
The DC go down for a crash and Clients of Domain can't get logon.....

Now i will looking for FSMO roles, but for you, is possible that all clients can't get logon for roles?

If DC1 "DHCP Server" go down.....the clients that doesn't get IP from server..can use the last IP assigned form dhcp!! It's wrong?

Thanks and bye bye
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Steve KnightIT ConsultancyCommented:
Users should still be able to logon but yes if you run DHCP On one DC then you need to replicate it to the other and make sure users have both DNS servers listed for instance.

FSMO can easily be quickly seized in the event of a server failure and the various roles can be shared amongst the servers in the first place to.

Always a good idea to check your network can run on each server out of the two during your testing phase...
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