Question : External DNS for OWA with NLB

Hi

I guess it might sounds a little stupid, but we have 2 Client Access Server (Exchange 2010) in NLB.  The firewall rules have been created accordingly to be redirected to the mail.domain.com Internal DNS record.  No problem there.

On the External managed DNS the Client Access server names have been added too.  But we have only one mail.domain.com A record   this record is redirecting the requests to the IP of the first CAS server.  

But in the event that this server goes down, no matter how many network load balancing CAS we have the user will get an error if he's trying to connect to OWA.  

I guess I missed something.  But I can't add a record with the same name (mail.domain.com) and another IP, right ?  It's not like a MX record.  

Thanks

Answer : External DNS for OWA with NLB

I am not sure I understand your setup correctly but in short it should be like this


OWA is accessed externally through https://mail.domain.com/owa

mail.domain.com A record points to real IP 1.1.1. on firewall

firewall is configure to send all HTTPS(443) requests coming on 1.1.1. to the NLB IP of the CAS

so if this is what you did you should have no problems