I am deploying the following: 1 Edge 2 node cas array 2 member dag 2 hubs All roles will be collocated with the exception of Edge total of 3 servers. DNS round robin will used I know how to install and cofingure all above my confusion is with Public DNS records and public name (OWA). Since a CAS array will be used and Edge how will external DNS A record be configured? Will the Public name for OWA be pointing to the edge public IP which will then be natted to casarray? Also is there a need to put in OWA name on internal dns for cas array with both IP addresses? Thanks

To keep it simple how do I configure External and Internal Records to allow public access? And where should everything be pointing i.e. Edge external IP. Thanks Again

Hello, in this constellation you'll point your MX record to the Edge server and the DNS record to either directly to your CAS array or to your router which is forwarding port 443 to your CAS array. It would be better to publish both over a Forefront TMG server. And I won't use Round Robin for your CAS array since a half of your requests will fail if one of your servers in the CAS array is down. Use a hardware load balancer instead of separate the CAS roles to two separate servers and use Windows NLB. If you want to reach high availability consider also to implement a second Edge server. You can use either NLB oder two MX records for high availability for Edge. Greetings, Toni

Hi Toni thanks for responding I read the SOW wrong it will be HA for multiple edge no RR for cas so what you are saying is this Public DNS Records Multiple MX --> Edge Servers A --> CASArray as an MX record points to an A record this will be for MX or CasArray? Thanks

For SMTP you need to use MX records, have 2 MX, pointing to each Edge server (either have smae cost or different, depends if you want to have HA/DR). For CAS you need HTTPS, you will have a sinlge DNS record pointing to the thh CAS server or CAS Array. (Directly or via a reverse proxy/firewall).Sukh

Here's my feedback, just a point from your design You planning to use it like: 2 cas 2 hub 2 mbx 1 edge ----------- why not install 3 multi-role servers and then purchase a hw lb instead then you can use an additional server as a edge so you will have a more redundant solution And yes, point the MX to the Edge and port 443 into the cas array, port forward or publishing using TMG (recommended) is your choice Jonas Andersson | Microsoft Community Contributor Award 2011 | MCITP: EMA 2007/2010 | Blog: http://www.testlabs.se/blog | Follow me on twitter: jonand82

Thank you everyone i am no longer confused thanks to you all! Jonas unfortunately this was the project put in place however the design is not yet finalized so i will bring up your suggestion, thanks again! Rasheedah