At #denog17, the people behind #Netzbremse unveiled a new feature: a #speedtest using five different transit providers to (hopefully) uncover unfair peering practices of ISPs, in this case the #DeutscheTelekom #Telekom, but this is very likely helpful for other situations as well. I wanted to dig deeper and found that it uses five different IPv4 prefixes of #Cloudflare that are advertised to different transit providers. Using #HurricaneElectric’s BGP view we get:
- https://bgp.he.net/net/104.29.111.0/24#_graph
- https://bgp.he.net/net/104.29.124.0/24#_graph
- https://bgp.he.net/net/104.29.125.0/24#_graph
- https://bgp.he.net/net/104.29.126.0/24#_graph
- https://bgp.he.net/net/104.29.127.0/24#_graph
I’m not deep enough into the BGP game to understand what transit provider is really pushed for in each prefix.
(unfortunately #IPv4only, I guess they didn’t want to dedicate five /48 prefixes as well for this project).
Link to the speedtest: https://netzbremse.de/speed/