In your previous mail you wrote: I am still colelcting implementation data, so I may be misled by what I have gotten. But it seems to me that we are unfortunately stuck with UDP with 0 checksums if we want high capacity tunnels to be able to make use of ECMP / LAG in the moderate time period (out through at least 5 years, maybe longer.) => no, you can use varying IPv6 addresses with any no-checksum encapsulation from now (and flow labels in some years...).
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