The IPv6 MTU should be much loser, often 1280.
I would try some Public IPv6 test Sites for diagnosis.
I would try some Public IPv6 test Sites for diagnosis.
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Show posts Menu# ntpq -pn
remote refid st t when poll reach delay offset jitter
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0.opnsense.pool .POOL. 16 p - 64 0 0.000 +0.000 0.000
1.opnsense.pool .POOL. 16 p - 64 0 0.000 +0.000 0.000
-167.235.70.245 195.176.26.204 2 u 50 64 377 8.227 +1.809 0.717
-94.130.23.46 192.53.103.104 2 u 55 64 377 10.171 +1.528 1.480
+129.70.132.35 129.70.137.82 2 u 45 64 377 14.946 +0.132 1.790
#195.201.19.162 118.163.81.62 2 u 49 64 377 7.501 +3.352 0.813
#217.160.19.219 10.50.0.2 2 u 50 64 377 17.507 +0.239 1.564
+130.162.220.39 169.254.169.254 3 u 46 64 377 8.524 +0.076 2.188
-109.230.228.196 131.188.3.220 2 u 42 64 377 9.220 +0.843 1.463
+185.194.239.35 192.53.103.108 2 u 41 64 377 8.808 +0.315 1.492
*178.215.228.24 189.97.54.122 2 u 43 64 377 6.900 -0.361 0.951
+217.144.138.234 192.53.103.108 2 u 41 64 377 12.266 +0.149 1.294
-167.235.139.237 237.17.204.95 2 u 103 128 377 8.148 +1.826 4.177
+192.248.187.154 91.135.4.191 2 u 30 64 377 6.800 +0.014 1.238
+109.123.244.54 79.143.250.33 2 u 37 64 377 9.491 -0.388 1.525
-157.90.24.29 193.79.237.14 2 u 99 128 377 8.435 +1.922 1.585
-217.91.44.17 237.17.204.95 2 u 95 128 377 22.769 +2.087 0.746