This is puzzling me....We have a small SBS 2011 network, modem/router - fixed IP, DHCP disabled, patch lead to switch. Networked PCs to switch, SBS box patched to switch - SBS: DNS server, DHCP server - all was working fine until this weekend. ISP had some service issues - Monday morning network was erratic - router light eventually showing internet connection but clients had intermittent connectivity both to server and internet.
Nothing particular showing in logs. Ran fix my network - couldn't find router. Ran troubleshooter and reported DNS unresponsive. Started to swap out items - replaced router - worked for a while, installed new NIC, swapped out switch, replaced patch leads. The only way that I can get clients onto domain and internet (ad working efficiently) is using the ports on the router - as soon as I introduce the switch, internet goes, server connectivity goes. I have tried to re run internet wizard - it doesn't find the router but if I manually input the IP addresses of the server and router it works.
I need the additional ports that the switch provides (and this all worked quite happily for 6 months before this weekend). Should I remove the DNS and DHCP services and reinstall these services?
Any guidance would be massively appreciated