Digi Connect IT 4 User Manual page 498

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c. For Interface, select the appropriate interface from the dropdown.

d. Click  again to allow access through additional interfaces.

To limit access based on firewall zones:

a. Click Zones.

b. For Add Zone, click .

c. For Zone, select the appropriate firewall zone from the dropdown.

d. Click  again to allow access through additional firewall zones.

5. (Optional) Cache negative responses is enabled by default. Disabling this option may improve

performance on networks with transient DNS results, when one or more DNS servers may

have positive results. To disable, click to toggle off Cache negative responses.

6. (Optional) Query all servers is enabled by default. This option is useful when only some DNS

servers will be able to resolve hostnames. To disable, click to toggle off Query all servers.

7. (Optional) Rebind protection, if enabled, prevents upstream DNS servers from returning

private IP addresses. To enable, click Rebind protection.

8. (Optional) Allow localhost rebinding is enabled by default if Rebind protection is enabled.

This is useful for Real-time Black List (RBL) servers.

9. (Optional) To add additional DNS servers:

a. Click DNS servers.

b. For Add Server, click .

c. (Optional) Enter a label for the DNS server.

d. For DNS server, enter the IP address of the DNS server.

e. Domain restricts the device's use of this DNS server based on the domain. If no domain are

listed, then all queries may be sent to this server.

10. (Optional) To add host names and their IP addresses that the device's DNS server will resolve:

a. Click Additional DNS hostnames.

b. For Add Host, click .

c. Type the IP address of the host.

d. For Name, type the hostname.

11. Click Apply to save the configuration and apply the change.

Command line

1. Select the device in Remote Manager and click Actions > Open Console, or log into the

Connect IT 4 local command line as a user with full Admin access rights.

Depending on your device configuration, you may be presented with an Access selection

menu. Type admin to access the Admin CLI.

2. At the command line, type config to enter configuration mode:

Digi Connect IT® 4 User Guide

Firewall configuration

for information about firewall zones.

Configure DNS