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To configure a firewall rule:
- Go to your Cloud menu.
- Click the label of the machine to which you want to configure a firewall rule.
- Click the Network -> Firewall tab.
- On the page that appears set the following:
- Choose the network interface.
- Specify if the rule defines requests that should be accepted or dropped.
- Set the IP address for which this rule is active.
- Leave the empty field to apply this rule to all IPs
- Enter hyphen-separated IPs to apply the rule to an IP range (e.g. 192.168.1.1-192.168.1.10)
- Enter the IPs with slash to apply the rule to CIDR (e.g. 192.168.1.1/24)
- Set the port for which this rule is effective.
- Leave the empty field to apply the rule to all ports
- Enter colon-separated ports to apply the rule to a port range (e.g. 1024:1028)
- Enter comma-separated ports to apply the rule to the list of ports (e.g. 80,443,21)
- Choose the protocol (TCP or UDP).
- Save the rule.
The Int1 ACCEPT 122.158.111.21 22 TCP firewall rule means that the Int1 network interface will accept all the requests and packets addressed from a 122.158.111.21 IP using TCP protocol on a 22 port.
The Int2 DROP 122.158.111.21 22 UDP firewall rule means that the Int2 network interface will reject all the requests and packets running from a 122.158.111.21 IP using TCP protocol on a 22 port.
Because some rules can override each other, it is important to set the order in which they are processed. Use the up/down arrows next to a rule to set priority.