Firewall rules are applied on a higher level in the networking hierarchy, which means that any requests to be filtered are already dropt before reaching your instance, reducing your bandwidth usage.
The DevCapsule Cloud Firewall is compatible for both IPv4 and IPv6 while each Internet Protocol requires it's own rules. This means, they are both unrelated to each other and fully independent.
By using the DevCapsule Cloud Firewall there is no interrupt on your current traffic. This means, while you're not allowing Port 22 incoming, your VM is still able to reach other devices on the port in question.
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