I'm in the process of adding a second DC to our domain and just want to make sure I have all the steps right before proceeding.

Info:

DC1 is 2008 R2 Standard.

DC2 is 2008 R2 Standard.

Network1 is 192.168.39.x/24

Network2 is 10.0.0.x/24

VPN is Sonicwall.

The 2 DC's will be at two different sites, but the networks are connected by hardware VPN. (Sonicwall). The main DC server will be on the 192.168.39.0/24 network. The 2nd DC will be on 10.0.0.0/24.

Here are the steps I plan to take; please let me know if I'm missing anything.

Part 1:

AD Sites and Services on DC1, create a new site and subnet for DC2. (Or should I create a new one for both?)

(Can I use the default IPSiteLink and not change anything in there other than refresh timer?)

Part 2:

Point the DNS of DC2 to DC1. Run /forestprep and /domainprep (on both, or just DC1?).

Dcpromo and select "Additional Domain Controller for Existing Domain". Then continue with normal steps with default locations for databases.

EDIT: Didn't realize this was like reddit and required two skipped lines to skip one :P

EDIT 2: When DCPromo-ing DC2, do I need to have "Append primary and connection specific DNS" and "Append parent suffixes of the primary DNS suffix" checked?