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[FW1] Cannot connect using public address



We recently moved to usiing NAT on our firewall:
 
Private range: 192.168.0.0 -- 192.168.0.1- 192.168.0.100 for servers switches etc
 
DHCP: 192.168.0.101 - 254 DHCP clients
 
We have internal web servers and mail server with FQDNs that outside can access no problems by using static NAT.
 
Problem is internal client cannot connect to these public (statically natted) ip addresses within the local network.
 
They can connect to it with the private address.
 
The only fix I have so far is by putting host files in their machines so that the web and mail servers gets resolved to the private ip address. Also using internal DNS.
 
Question is why are these internal clients not being able to access the public ip address of the web server. I cannot ping this web server by its public ip address.
 
I can ping the firewall both internal anfd public ip address. 
 
 
Yes the web server's statically nated address is in the same subnet as the firewall's external ip. 


 
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