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Why aren't openvpn server iptables rules put in their own chain?

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When iptables rules for my n66u openvpn servers are started, they are inserted at the top of the chain when the openvpn servers start. This can prevent dropping packets to the servers because any blacklisting rules would then be moved down.

Why would openvpn servers not start their own chain(s)? That way they would not be fighting for a top spot on the INPUT chain. Wouldn't it would also permit a user to insert rules with firewall-start at the top of the INPUT chain without waiting for...

Why aren't openvpn server iptables rules put in their own chain?

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