User`s guide

Additional DNS Records
After a zone has been created, you can edit its records or add NS records, A records, and any of the following records to the zone:
Record Description
Mail Exchanger (MX)
MX records point to the email servers that are responsible for
handling email for a given domain. There should be an MX record for
each email server, including any backup email servers. If an email
server lies within the domain, it requires an A record for each name
server. If the email server is outside the domain, specify the FQDN of
the server, ending with a dot.
Example: mail.my-isp.net
Text (TXT)
Text records allow text to be associated with a name. This can be
used to specify Sender Policy Framework (SPF) or DomainKeys
records for the domain.
Canonical Name (CNAME)
A CNAME record provides a mapping between this alias and the true,
or canonical, hostname of the computer. It is commonly used to hide
changes to the internal DNS structure. External users can use an
unchanging alias while the internal names are updated. If the real
server is outside the domain, specify the FQDN of the server, ending
with a dot.
Example: server1.my-isp.net
If a domain name has a CNAME record associated with it, then it
cannot have any other record types. Do not use CNAME defined
hostnames in MX records.
Service (SRV)
Service records are used to store the location of newer protocols,
such as SIP, LDAP, IMAP, and HTTP.
Pointer (PTR)
PTR records point to a canonical name. The most common use is to
provide a way to associate a domain name with an IP address.
Other (OTHER)
Use an OTHER record to add a type of DNS record that is not
supported, such as NAPTR.
More information about these records and their attributes can be found in the online help.
Back to .How to Configure Authoritative DNS
How to Configure an Authoritative DNS Host
To make the Barracuda Firewall an authoritative DNS host, complete the following steps:
Step Explanation
Step 1. Enable Authoritative DNS on the Barracuda Firewall Enable the DNS Server service on the links and the service on the
Barracuda Firewall.
Step 2. Create One or More Domains Define one or more domains on the Barracuda Firewall.
Step 3. Set up DNS for Internal Clients (Split DNS) Make your internal DNS server forward queries to the Barracuda
Firewall. Configure split DNS.
Step 4. Add More DNS Records Add more DNS records for web servers and email servers.
Step 5. Update Your Domain Registrar Tell the Internet that your domain exists or has changed.
Step 6. Test Test external access.