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Barracuda Link Balancer

How can I access public servers behind the LAN of the Barracuda Link Balancer from the internal network?

  • Type: Knowledgebase
  • Date changed: 3 years ago
Solution #00004132

All Barracuda Link Balancer models, firmware version 1.2 and above

The Barracuda Link Balancer supports a Split DNS infrastructure. If the same hostname is used for a resource that is accessible both internally and externally, internal network clients receive the internal IP address and external clients receive the external IP address when they ask for the address of that hostname. Specifically, the A record for the hostname includes two views, one with the internal IP address and one with the external IP address. In this way, clients only see the address that they should use.

Use the DNS Records section on the Services > Authoritative DNS page. For instructions on adding an Authoritative DNS entry go to solution #00004131. Upon configuring the IP Addresses for the new record, the IP address field should contain the public address used for access, the Local Network field should contain the internal IP address.

Additional Notes:
When the Barracuda Link Balancer creates A records it checks for the mapping provided by the 1:1 NAT and port forwarding rules that have been created. In some cases, this mapping will not reflect your configuration. Or, perhaps there is no mapping because the built-in firewall is disabled. If needed, in the Local Network field, update or add addresses to be used in response to internal DNS queries.You can also choose INTERNAL ONLY from the Interface list to add a local IP address for this host name.

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