Showing results for 
Search instead for 
Did you mean: 

Load Balancing


There are two Unix server A and B acting as a reverse proxy server.

Both the server A and B Natted with public IP to C and D respectively on Cisco ASA 5540 firewall.

The Public IP C and D got registered in public DNS server for Domain name registration using round robin method.

Now the requirement is if the server A goes down will the firewall Cisco ASA automatically redirect the whole traffic towards B server? This is something load balance support providing on Cisco ASA firewall.

1 Reply 1

Cisco Employee
Cisco Employee

Hi Ricky,

Unfortunately, the ASA does not support this functionality. The static NAT statements that you have configured that map A to C and B to D are not aware of the status of the servers, so if a client tries to connect to C, the ASA will try to forward the request on to A regardless of the status of A.

This type of functionality is usually acheieved with a dedicated load balancer, which will keep track of the state of your servers and route the requests accordingly.

Hope that helps.


Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Recognize Your Peers