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subdomain linked to different server

We have a domain in an organisation (e.g. mydomain.com). In our Firewall  (Fortinet 60B) the eksternal IP of this domain is redirected to an internal server. (e.g. 192.168.0.10)
I would like to create a subdomain (sub.mydomain.com) which is linked to a different internal server (e.g. 192.168.0.20).  How can achieve this by configuring internal DNS and the firewall?

Since there is a redirect in the firewall which sends the user to 192.168.0.10 do I need a different external IP for the subdomain and redirect this IP to the internal server (192.168.0.20)? Or is there a way in the firewall to redirect requests based on URL and not IP?

Do I need to contact my ISP and ask them to redirect this particular subdomain to an IP? Or will the subdomain automatically request the same IP address as the top domain?

We are using exchange 2003 / Active Directory
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mintraas
Asked:
mintraas
1 Solution
 
KOTiSCommented:
You can create as many subdomains as you like on your dns server - you don't have to register them... it's free as long as you own the domain. You just add a host (A) record on your dns named for example server and that server's external IP (check your dns file and just add a similar entry) and then your dns server will be able to translate this entry to server.domain.com - that's all...

You should configure your firewall with a NAT translation rule so that server is accessible from the outside world with it's internal IP address. Just check NAT entries on your firewall for other entries and add a similar one for your new server...
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