I assist a small office with technical issue from time to time and I encountered an issue that I just can't seem to solve:
3Com Baseline 2924 Switch
DLink Wireless AC1750 Router
Motorola 585100 Cable Modem
Intel board Server, running Windows 2008 R2 Server.
Windows XP/7 clients
the Office has one Server that is a Primary file server that is also AD, DNS Server.
I've been getting calls about the internet dropping and users losing connection to the server. My findings was that the old dlink router had issues so I replaced it with a new dlink wireless router. I also performed a dcdiag on the server and encountered some errors relating to DHCP and DNS. It turns out that the server IP config is a Class C subnet along with the router, both having a 192.168.X.X. for some reason, if I delete the static IP settings on the server and on the client PCs, they get internet access, however, if I do this, the clients don't have access to the server resources (share folders). But if I give a static IP or allow dynamic, client PCs have access, but no internet access. when I click the fix option in the "Network and Sharing Center" on the server, it tells me to setup DHCP.
I tried to create a Class A subnet for internal use, setup all clients with new IP subnet and, again, I can't get internet access???? So, now I went back to 192 subnet and now the server and clients get out and have access to server resources, but now, a user can launch a brower to Yahoo and Google as home page, it loads, they do a search, they get results. Now, here's the problem, when they click a link any link on this page, page doesn't load.
I turned off all firewalls,filters, Antivirus program and this still happens. I'm thinking the ISP has to provide a gateway address instead of the default router address and I need to plug this address in the "Default Gateway" field.
If anyone can shine a light on this issue, it would be greatly appreciated.