We upgraded from 20 Mbps to 50 Mbps DIA about two months ago. This required a router upgrade as well. Since then, anyone who starts a large HTTP download - e.g. an ISO, large spreadsheet or log, movie file, etc. - can take all of the available bandwidth and block others from accessing the internet.
The old router didn't have any kind of QoS configured on it. Further, it was a very vanilla config. It simply had some named ints, the security levels of each, and the IP addresses associated with each int. The ISP supplied the new router and we don't have access to view the config, but they said they don't have any kind of QoS configured on it either.
My questions are:
Why when we had 20 Mbps service did we not have this problem where any one user could monopolize all the bandwidth to the internet?
Am I correct in thinking that Quality of Service configurations would prevent this or does QoS simply identify which traffic has priority over another, and does nothing for competing traffic of the same type?
If it's the latter, and my vocabulary is wrong, what statements do I need to configure and where (we have a Cisco 4507 core switch, a Cisco Pix on the primary ISP, a Cisco ASA on the backup ISP, and the inaccessible ISP router is a Cisco 2911) so that no one user can take all the available bandwidth to our internet connection?