I am auditing a little company that has 10MB internet bandwidth. It should be enough for 50 users. They have a Fortinet firewall with a DMZ module. The idea behind the DMZ is to have a webserver that host the company's home page. It has a public IP address associated to an internet domain.
I have found that the DNS configured in all users machines (windows 7 pro) is the same machine been used as the webserver. I am thinking that this can be the cause of the bottleneck.
The webserver and DNS machine is a Windows 2008 R2 standard server with i7 processor, 8GB RAM, an integrated Network card Realtek PCIe GBE Family Controller with netBios over TCP enabled.
Can you please comment or suggest how can I confirm this can be the cause of the bottleneck?