i'm searching for the following.
I have a few Cisco ASA firewalls to manage. I'm wondering if the following is possible: (example)
I got a mail server with webmail in my internal netwerk (Internal ip is for exampje: 192.168.1.1. On my Cisco ASA i create a NAT/Firewall rule that webmail is accessible from the internet. (External ip is for example) 22.214.171.124
I create a extenal DNS entry that webmail.example.com directs to: 126.96.36.199.
But now it is not possible to access webmail from the internal network with the created DNS entry.
I solve this by creating a internal DNS entry that points to the internal adress 192.168.1.1.
This costs me a lot of double work.
Is there a way that the Cisco ASA understands that when i try to access webmail from it's own external address that it directs me trough the NAT rule back inside the internal network to my mail server.
If it is not completly clear i could make you a visio drawing.