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It took way too long to figure this out (finally 0.0% packet loss/dup to cloudflare), so I thought I'd mention it here:
If you're getting dropped & duplicate packets (DUP! with ping on linux, windows doesn't show). It's likely the "Downlink MAC Address", in my case I actually had to set it to the Uplink (WAN) MAC Address. Could be mislabeled, or something with my setup specifically (the PE is not very reliable; XS-2426G-B).
Also if you are always getting an IPv6 /64 address on WAN with "Request Prefix only" enabled: find the gateway address in settings (save); set WAN as static IPv6 with same address but /128. Then manually re-make the IPv6 gateway using the previously saved gateway address. I assume this happens when the PE doesn't really support prefix delegation at all.
If you're getting dropped & duplicate packets (DUP! with ping on linux, windows doesn't show). It's likely the "Downlink MAC Address", in my case I actually had to set it to the Uplink (WAN) MAC Address. Could be mislabeled, or something with my setup specifically (the PE is not very reliable; XS-2426G-B).
Also if you are always getting an IPv6 /64 address on WAN with "Request Prefix only" enabled: find the gateway address in settings (save); set WAN as static IPv6 with same address but /128. Then manually re-make the IPv6 gateway using the previously saved gateway address. I assume this happens when the PE doesn't really support prefix delegation at all.
