Configure RNAT with LLB

September 14, 2021

Contributed by:

S C

You can configure an LLB setup for reverse network address translation (RNAT) for outbound traffic. It ensures that the return network traffic for a specific flow is routed through the same path. First configure basic LLB, as described inConfiguring a Basic LLB Setup, and then configure RNAT as described inConfigure RNAT. Then enable “use subnet IP (USNIP)” mode.

In the following diagram, the Citrix ADC appliance uses LLB to route outbound traffic to different links. During the RNAT operation, the ADC appliance replaces the source IP addresses of the outbound traffic with the public NAT IP address (198.141.23.1) to route the traffic through ISP-1. Similarly, the ADC appliance replaces the source IP addresses with 198.140.23.1 to route the traffic through ISP-2.

RNAT with LLB

To add SNIPs for ISP routers by using the CLI

At the command prompt, type:

add NS IP   -type SNIP add NS IP   -type SNIP

Example:

              add ns ip 198.140.23.1 255.255.255.0 -type snip add ns ip 198.141.23.1 255.255.255.0 -type snip 
             

To configure RNAT by using the CLI

At the command prompt, type:

add rnat  ( | ( [-redirectPort ])) bind rnat  @ … show rnat

Example:

              add rnat RNAT-1 192.0.2.0 255.255.255.0 bind rnat RNAT-1 -natIP 198.140.23.1 bind rnat RNAT-1 -natIP 198.141.23.1 > show rnat RNAT-1 1) RNAT Name: RNAT-1 Network: 192.0.2.0 Netmask: 255.255.255.0 Traffic Domain: 0 UseProxyPort: ENABLED NatIP: 198.140.23.1 NatIP: 198.141.23.1 
             

To configure RNAT by using the GUI

Navigate toSystem>Network>NATs.
On theRNATtab, clickConfigure RNAT.
Specify the network on which to perform RNAT.

Note

You can also configure RNAT by using Access Control Lists (ACLs). ReferConfiguring RNATfor details.

To enable Use Subnet IP mode by using the CLI

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 GUI

Navigate toSystem>Settingsand, underModes and Features, clickConfigure Modes.
In theConfigure Modesdialog box, selectUse Subnet IP, and then clickOK.

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Configure RNAT with LLB

September 14, 2021

Contributed by:

S C

September 14, 2021

Contributed by:

S C

Configure RNAT with LLB

To add SNIPs for ISP routers by using the CLI

To configure RNAT by using the CLI

To configure RNAT by using the GUI

To enable Use Subnet IP mode by using the CLI

To enable Use Subnet IP mode by using the GUI

In this article