Diameter support for rewrite

Last published : Sep 24, 2026
The Rewrite feature now supports the Diameter protocol. You can configure Rewrite to modify Diameter requests and response as you would HTTP or TCP requests and responses, allowing you to use Rewrite to manage the flow of Diameter requests and make necessary modifications. For example, if the "Origin-Host" value in a Diameter request is inappropriate, you can use Rewrite to replace it with a value that is acceptable to the Diameter server.
Related information

To configure Rewrite to modify a Diameter request

To configure the Rewrite feature to replace the Origin-Host in a diameter request with a different value, at the command prompt, type the following commands:
  • <add rewrite action \&lt;actname\> replace "DIAMETER.REQ.AVP(264,\\"NetScaler.example.net\\")" For \&lt;actname\>, substitute a name for your new action. The name can consist of from one to 127 characters in length, and can contain letters, numbers, and the hyphen (-) and underscore (\_) symbols. For NetScaler.example.net, substitute the Host-Origin that you want to use instead of the original Host-Name.
  • add rewrite policy \&lt;polname\> "diameter.req.avp(264).value.eq(\\"host.example.com\\")" \&lt;actname\> For \&lt;polname\>, substitute a name for your new policy. As with \&lt;actname\>, the name can consist of from one to 127 characters in length, and can contain letters, numbers, and the hyphen (-) and underscore (\_) symbols. For host.example.com, substitute the name of the Host-Origin that you want to change. For \&lt;actname\>, substitute the name of the action that you just created.
  • bind lb vserver \&lt;vservername\> -policyName \&lt;polname\> -priority \&lt;priority\> -type REQUEST For \&lt;vservername\>, substitute the name of the load balancing virtual server to which you want to bind the policy. For \&lt;polname\>, substitute the name of the policy you just created. For \&lt;priority\>, substitute a priority for the policy.
Example:
To create a Rewrite action and policy to modify all Diameter Host-Origins of "host.example.com" to "NetScaler.example.net", you could add the following action and policy, and bind the policy as shown.
> add rewrite action rw_act_replace_avp replace "diameter.req.avp(264)" "diameter.new.avp(264,\"NetScaler.example.net\")"
> add rewrite policy rw_diam_pol "diameter.req.avp(264).value.eq(\"client.realm2.net\")" rw_act_replace_avp
> bind lb vserver vs1 -policyName rw_diam_pol -priority 10 -type REQUEST

Done