I have a virtual DC running DNS and Routing and Remote Access, that routes ALL workstations Internet traffic out to the Internet, this works fine but noticed that the Internet drops occasionally.

I've checked with our service provider (Managed Communications) and they are adamant that it's not their fault.

The Internet drops seem to affect everyone.

We also have a server configured to use the same Internet service on a different network over a site-to-site VPN connection which also suffers from packet drops.

I've spoken to Cisco and have done many tests with Cisco and they believe the problem is down to the ISP.

I'm wondering if it's a DNS issue, as the Internet service uses OpenDNS.

Any ideas?