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In Linux, IPv6 security is maintained separately from IPv4. For example, “iptables” only maintains firewall rules for IPv4 addresses but it has an IPv6 counterpart called “ip6tables”, which can be used to maintain firewall rules for IPv6 network addresses.
If your VPS is configured for IPv6, please remember to secure both your IPv4 and IPv6 network interfaces with the appropriate tools. For more information about IPv6 tools, refer to this guide: https://www.digitalocean.com/community/tutorials/how-to-configure-tools-to-use-ipv6-on-a-linux-vps
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