On 13/01/2025 23:35, Fredy Künzler via swinog wrote:
Ping works for me (Init7). Seems to be resolved, though I can't check the routing via Sunrise - Cogent. Our traceroute tool is here: https://www.as13030.net/traceroute.php
I don't consider this a peering issue, as neither Sunrise nor Init7 peers with California based Amazon infrastructure. There are different transit providers in between, and as both options are showing the same result I suppose it was an Amazon problem.
But - question: Why is 20min.ch (Cloudfront client, apparently) resolving to an address which is physically in California? That seems a rather inefficient routing / CDN mapping. I suggest to change your resolver to something more decent which resolves 20min.ch to a Switzerland based Cloudfront cache. It's not uncommon that CDN mapping breaks when using 8.8.8.8 and alike instead of the providers DNS resolver.
Quad9 has multiple flavours of DNS and one of them has "EDNS Client-Subnet" enabled, but it's not the default one. So for anyone who cares enough to use Quad9 but still wants to benefit from local CDNs, it would be 9.9.9.11 instead of 9.9.9.9 (ref. https://www.quad9.net/support/faq/#edns).
I assume any other mainstream non-ISP DNS provider also offers this distinction.
Cheers!