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    So clearing the iptables rulesets makes the ping work. What was in those rulesets? Commented Mar 11 at 21:39
  • @ChrisDavies hi! How may I share the result from the command sudo nft list ruleset, I'm asking because it has 800+ lines. Thanks. Commented Mar 11 at 22:33
  • I'd suggest iptables -nvL … rather than nft list… since you've already shown the iptables compatibility layer to flush the tables Commented Mar 11 at 22:50
  • @ChrisDavies I edited my question with the output from the command iptables -nvL from the master and from the worker nodes. Commented Mar 11 at 23:19
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    On the worker if you run (just) iptables -F INPUT does the ping start working? If not, you need to add some more of the iptables rules to match the iptables -F options you used to make the it work Commented Mar 11 at 23:34