While traceroutes TO your usenet providers are useful, I am much more interested in the routing from them to me. If I trace to Astraweb from my home I get sent via Limelight (the llnw.net) but using their traceroute function via their site shows that my downloads get to me via Level3. This is much more important to me if I am having slow or sluggish downloads as Limelight might be fine but Level3 could be congested. You really need both to be able to diagnose problems that might crop up.
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