Lets say your fibre provider is Openserve/Telkom and your ISP is Axxess. Same as when you had a DSL line with Telkom and your ISP was MWEB or whatever.
So now you have an issue with speed or whatever. You log a ticket with your ISP that you are not happy. You tell them you only get 50Mbps on a 100Mbps line. The problem could be with the line or your ISP. How do you prove where the problem lies?
Your ISP will then ask you to do a speedtest and send them the results. Because you do not have all your eggs in one basket, you will have to do two speedtests. The first is via your ISP. When you signed up at your specific ISP, you received a Username and Password that you have to enter into your ADSL/VDSL modem. This then gets you access to your speed and package that you signed up for at your ISP. So you open the SAIX website with the 4 servers listed and test the speed of your line via your ISP and record the results.
This is what you did. This I also did and got a result from all 4 servers. This will show if you get the speed you signed up for. In my case I should get close to 100Mbps on all four. London can be a bit lagging as it is quite far away, but anyway.
The second part of the test is to log in with Username guest@openserve and Password guest. This will not give you access to the internet, but you will still be able to open the SAIX website and do a speedtest to 3 of the 4 servers. There is a disclaimer at the bottom that you will not be able to reach London using the guest account.
I have always been able to do a successful speedtest on Durban, CT and Rosebank using the guest account. If you now go read my OP, you will see it is not the case anymore, and Telkom/Openserve recons that is right. You are only supposed to reach the one closest to you. I am asking others to test this to confirm. And if true now, when and why did it change?
So, lest say you get 100Mbps on guest, but only 50Mbps on your ISP account, then the problem is with your ISP and they have to fix. If you get 50 on both, then the issue is with your fibre provider and your ISP will log a ticket with the provider.
Hope this explains it?