This is explicitly answered in the second blog post [2] of a 3-part [1,2,3] series over at the anapaya website: > A careful reader may have gotten the impressi

This is explicitly answered in the second blog post [2] of a 3-part [1,2,3] series over at the anapaya website: > A careful reader may have gotten the impression that SCION is simply source routing in disguise, however, this is not the case for a variety of reasons. First of all, end hosts do not learn any information about topology inside the Autonomous System (AS) - this is still under the control of the local network administrators who may want to implement complicated firewall rules or in any other way affect the traffic in their local networks. > While with SCION the end-host selects the path of the packet, it cannot perform this selection completely independently. Instead, the network operator distributes the available paths and the end-host can only choose from this pre-selected set. [1] https://www.anapaya.net/blog/the-scion-series-part-1 https://www.anapaya.net/blog/the-scion-series-part-1 [2] https://www.anapaya.net/blog/the-scion-series-part-2 https://www.anapaya.net/blog/the-scion-series-part-2 [3] https://www.anapaya.net/blog/the-scion-series-part-3 https://www.anapaya.net/blog/the-scion-series-part-3