Each Cloud Firewall can be applied to multiple Linodes, Linode interfaces and NodeBalancers.

• For Linodes using Configuration Profile network interfaces, firewalls are assigned at the Linode level, and the same firewall rules apply to all non-VLAN interfaces in the profile.
• For Linodes using Linode network interfaces, separate firewalls can be assigned to the VPC network interface and the public network interface.

Use the steps below to view and modify the services utilizing a Cloud Firewall.

1. Log into your Cloud Manager and select Firewalls from the navigation menu.

2. From the Firewalls listing page, click on the Cloud Firewall that you would like to use. This takes you to the Rules page for that firewall.

3. Click either the Linodes or NodeBalancers tab to see a list of the respective services currently using the firewall.

Add Linodes, Linode interfaces and NodeBalancers

To add a Linode or Linode interface to this firewall, select the Linodes tab. To add a NodeBalancer to this firewall, select the NodeBalancers tab.

Click the Add Linodes/NodeBalancers to Firewall button. In the form that appears, select the Linode or NodeBalancer from the dropdown menu. If the Linode has Linode interfaces without an assigned firewall, an additional dropdown appears, allowing you to choose an interface.

Click Add. Once added, all rules configured on the firewall are applied to the selected service. Note that only inbound rules are applied to NodeBalancers.

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You can apply the Cloud Firewall to more than one Linode service at a time. Repeat this process to add additional Linodes, Linode interfaces or NodeBalancers.

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If Network Helper has been disabled on your Linode and the internal networking configuration uses DHCP for IPv4 address assignment, some additional firewall rules are necessary. You must edit the Cloud Firewall to allow DHCP traffic through port 67 and 68. If needed, a full list of IP addresses for our DHCP servers can be found in our DHCP IP Address Reference Guide.

Remove Linodes, Linode interfaces and NodeBalancers

To remove a Linode, Linode Interface or NodeBalancer from a firewall, click the Remove link. Once removed, the Cloud Firewall rules will no longer apply to that resource, which may leave it more vulnerable to malicious traffic or attacks.