Blocking a port using the Custom Rules

This example is written for the Canistracci OIL tenant. Create the objects with a Docs Demo prefix, test them on non-production numbers, and then adapt the same structure for the production tenant.

You can add custom rules to block an IP port from generic access and grant only to a specific set of IP addresses

Let's make an example. if you want to block ssh port 22 from any access except from IP 192.168.1.100, you can enter the following data

-s 192.168.1.100/32 -p tcp --dport 22 -j ACCEPT

-p tcp --dport 22 -j DROP

Please take in mind all IP in the "Always allowed list" will be always allowed, regardless what has been entered in the Custom Rules field

Validation

• Confirm the tenant selected in the top bar is Canistracci OIL before creating the example.
• Verify the created objects appear in the expected Configuration menu page.
• Place a controlled test call or run the related status check.
• Remove or disable temporary test numbers when the example is no longer needed.