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The documentation claims that "IPv6 has no global variables such as tcp_. tcp_ settings under ipv4/ also apply to IPv6" but this setting does not appear to work. However, setting the MTU to 1472 does fix my issue.Robin Green– Robin Green2019-06-22 13:26:33 +00:00Commented Jun 22, 2019 at 13:26
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1See this thread blog.cloudflare.com/path-mtu-discovery-in-practiceRui F Ribeiro– Rui F Ribeiro2019-06-22 15:10:26 +00:00Commented Jun 22, 2019 at 15:10
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How old is your kernel?Michael Hampton– Michael Hampton2019-06-22 17:08:09 +00:00Commented Jun 22, 2019 at 17:08
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It's 4.14, so not very.Robin Green– Robin Green2019-06-22 18:02:51 +00:00Commented Jun 22, 2019 at 18:02
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