Question

How to allow outbound traffic on a custom port in gcp

Answer 1

To allow outbound traffic through a custom port, you need to set up a firewall rule. 

For example, the following steps set up a rule that allows outbound traffic on port 2525.

 Replace port 2525 with the custom port of your choice.

1. In the Google Cloud Platform Console, go to the Create a firewall rule page.

2. Choose a name for the firewall rule.

3. Under Network, select the network that is hosting the VM instance that you intend to send email messages from.

4. Under Direction of traffic, select Egress.

5. Under Targets, choose the appropriate target for this rule. For example, you might choose Specified target tags if you want the rule to apply to instances that have a specific tag.

6. Under Destination filter, set 0.0.0.0/0 if you want to allow egress traffic from the VM instance to any destination. If you want to limit the destination, enter another IP range here.

7. Under Protocols and ports, select Specified protocols and ports, select tcp, and enter 2525.

8. Click Create to save your changes.