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Techlog · Feb 27, 2025

ip6tables - Do you spot the error?

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Some time ago I was asked why IPv6 wasn’t working. The customer had just configured some ip6tables rules and IPv6 stopped working. See if you can spot the error in the following example rule set: ip6tables -A INPUT -p ICMP -j ACCEPT ip6tables -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT ip6tables -A INPUT -p tcp --dport ssh -j ACCEPT ip6tables -A INPUT -j DROP The mistake is…

Read on /posts/ipv6tables-problem/

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