Product Documentation

Configuring RNAT with LLB

Aug 31, 2016
You can configure an LLB setup for reverse network address translation (RNAT) for outbound traffic. This ensures that the return network traffic for a specific flow is routed through the same path. First configure basic LLB, as described in "Configuring a Basic LLB Setup", and then configure RNAT. You must then enable use subnet IP (USNIP) mode.

To configure RNAT by using the command line interface

At the command prompt, type:

  • set rnat <network> <netmask>
  • show rnat

Example

 
set rnat 10.102.29.0 255.255.255.0 
> show rnat 
1)      Network: 10.102.29.0    Netmask: 255.255.255.0 
        NatIP: * 

To configure RNAT by using the configuration utility

  1. Navigate to System > Network > Routes.
  2. On the RNAT tab, from the Actions drop-down list, select Configure RNAT.
  3. Specify the network on which to perform RNAT.

To enable Use Subnet IP mode by using the command line interface

At the command prompt, type:

  • enable ns mode USNIP
  • show ns mode

Example

 
enable ns mode USNIP 
> show ns mode 
        Mode                           Acronym              Status 
        -------                        -------              ------ 
 1)     Fast Ramp                      FR                   ON 
 2)     …. 
 8)     Use Subnet IP                  USNIP                ON 
 9)     …

To enable Use Subnet IP mode by using the configuration utility

  1. Navigate to System > Settings and, under Modes and Features, click Configure Modes.
  2. In the Configure Modes dialog box, select Use Subnet IP, and then click OK.