Kewlx25 :
palladin9479 :
My ISP only sells dedicated bandwidth and never oversubscribes their interfaces.
That's so wrong....
The bandwidth limitation won't be at the distribution layer, that is piss easy to provide. The limitation will be either at the core router layer or at the egress points depending. ALL ISP's without exception, oversubscribe. If you have an aggregate layer serving 100 customers, each with 100Mbps subscription bandwidth, then you'd need to have 10Gbe of aggregate bandwidth just for those 100. Realistically your talking 500,000 subscribers for 50 Tbe (yes a T) aggregate bandwidth which is some ridiculously expensive equipment. Instead they will oversubscribe at a ration of 50~100 to 1 and possibly implement a large transparent proxy.
The entire Internet is oversubscribed. Petabits of edge bandwidth and only terabits of core bandwidth. The Internet runs on statistical multiplexing. Even the most expensive connections are oversubscribed by your definition.
Load testing my connection, running 24/7 ping tests over month long periods have resulted in 0.0001% packet loss to servers in other countries(Germany, England, and France) and less than 5ms of jitter, less than 1ms of jitter within the USA. Whatever you try to claim, I essentially get 100% of the bandwidth 100% of the time, with virtually no jitter and no loss.
All in all, I've had more issues with my LAN than my ISP.
And none of that matters in the slightest to your statement that your ISP only sells dedicated bandwidth and doesn't oversubscribe, which is factually incorrect.
They, like all ISP's, most certainly do oversubscribe. They are betting that over 95% of their use base won't be using their connection to the fullest, that only the power users, that fraction that is less then 5%, will actually bother doing speedtests and downloading large quantities of data. And so they sell you a connection with the "bandwidth" which is essentially a meaningless number only referencing the speed of the final connection.
ISP's themselves usually purchase bandwidth from a tier 1 network provider, even if they are the provider, most governments require them to purchase from themselves at the same rate they sell to other providers. That is the real bandwidth they are reselling, and it's usually sold at a ratio of 50 or 100 to 1. Buy 20Gbps worth of external bulk, sell 1Tbps worth to your customers. It's how they make money and the reason why ISP's in the USA don't want to upgrade their networks, they would have to buy more bulk to meet the new demand without increasing subscription fees which means lower profit margins.