If an internal server needs to receive traffic from more than one WAN link, create a 1:1 NAT or port forwarding rule (see: How to Create Port Forwarding Rules) for each WAN link. If you then create a DNS domain, the Barracuda Link Balancer will automatically generate A records based on the Port Forwarding and 1:1 NAT rules.
Before you Begin:
The WAN IP address is the IP address used for general purpose NAT. If necessary, add the publicly accessible IP addresses to the configuration.
- Log into the Barracuda Link Balancer Web Interface.
- Go to the Basic > Links page.
- Click the + sign to expand and edit the WAN link.
- Add Additional IP Addresses which are the external IP addresses that are eligible to be used for 1:1 NAT.
- Click Save Changes.
Create a 1:1 NAT Rule
- Go to the FIREWALL > NAT page.
- Enter a descriptive name in the Rule Name field.
- From the Listen Link drop down field, select the WAN link to use.
If desired, enter the hostname or the fully qualified domain name associated with the IP addresses in the Hostname field.
- In the Forward IP field, type the private static IP address of the server which must be reachable from the LAN of the Barracuda Link Balancer. Or, if creating a DNAT rule for a link, type a static IP address reachable through a WAN link (usually, the firewall IP address reachable through WAN1).
- Make sure that you clear the Disable check box to enable the rule.
- To write an entry in the Firewall Log whenever this rule is executed, select the Log check box.
- Select the Auto-create firewall rule check box to automatically create an inbound firewall rule to accept traffic for the external IP address.
- Click Add.