Environment:
- Two Windows 2008 R2, Exchange 2010 SP3 servers, currently holding all mailboxes
- Two Windows 2012 R2, Exchange 2013 SP1 servers, setup in progress
- Two Windows 2008 R2, TMG 2010, V7.0.9193.540 publishing both Exchange 2010 servers.
Scenario:
I need to continue having Exchange 2010 setup in TMG as is as the mailbox migration to 2013 will take weeks if not months and I have a project requirement to have Exchange Database Availability Group (DAG) functionality for all mailboxes throughout the project, so 4 servers are an absolute must. So I need to add Exchange 2013 in TMG and not just replace the 2010 setup with the 2013 setup and I cannot run one 2010 and one 2013 server.
Questions:
1. I currently only have 2 public IP addresses available to SMTP, mapped to the external interfaces of TMG, to allow my environment to be able receive emails on 4 Exchange servers (two 2010 and two 2013) I need to have 4 public IP addresses, is that correct?
2. Does anyone have a good general guide/blog for doing this (setting up Exchange 2013 in TMG in a coexistance scenario)?
This is nice, but doesn't really approach it from a coexistance scenario: