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Barracuda CloudGen Firewall
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How to Configure DNS Settings

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You can define the DNS domain or suffix for the CloudGen Firewall and the DNS server to be used for DNS requests. The Box DNS Domain field specifies the DNS suffix for the system. When a hostname is resolved, the suffix is automatically added to the DNS server during the DNS request. It is recommended to enter multiple DNS servers. With local DNS caching enabled, DNS queries will be forwarded to or cached from the specified DNS servers and DNS queries can be logged.

Configure Basic DNS Settings

  1. Go to CONFIGURATION > Configuration Tree > Box > Administrative Settings.
  2. In the left menu, click DNS Settings.
  3. From the Configuration Mode menu, select Switch to Advanced View.
  4. Click Lock.
  5. Enter the Box DNS Domain that the Barracuda CloudGen Firewall belongs to.
  6. In the DNS Server IP table, specify the DNS server's IPv4 and/or IPv6 addresses to be queried by the Barracuda CloudGen Firewall.
  7. Click Send Changes and Activate.

Configure Advanced DNS Settings

  1. From the Configuration Mode menu, select Switch to Advanced View.
  2. Click Lock.
  3. In the DNS Search Domains table, add the names of the domains that should automatically be appended to an alias name when performing a DNS query. Separate multiple domains with spaces.
  4. When using multiple DNS servers, 
    1. Select if DNS queries should regularly rotate between the servers from the DNS Query Rotation list.
    2. Specify the DNS Query Timeout in seconds. When the timeout is exceeded, the next DNS server is queried.
  5. To add local hosts,
    1. Click + in the Known Hosts section. 
    2. Enter a Name for the local host and click OK.
    3. Enter the Host IP address.
    4. Enter Fully Qualified Domain Name (FQDN), with dots as namespace delimiter.
    5. Add Aliases if applicable (no dots).
    6. Click OK.
  6. Click Send Changes and Activate.

The name and IPv4 addresses of local hosts are added to the system /etc/hosts file. By default, this file is consulted first for name resolution. It is useful to specify address/name pairs of locally known hosts for which no name resolution via DNS is available. The name and alias are used.