ADC

Using NULL Policy Based Routes to Drop Outgoing Packets

August 21, 2024

Contributed by:

C C

Some situations might demand that the Citrix ADC appliance drops specific outgoing packets instead of routing them, for example, in testing cases and during deployment migration.

NULL policy based routes can be used to drop specific outgoing packets. A NULL PBR is a type of PBR that has the nexthop parameter set to NULL. The Citrix ADC appliance drops outgoing packets that match a NULL PBR.

Configuring NULL PBRs for IPv4 Packets

To create a NULL PBR by using the CLI:

At the command prompt, type:

-  **add ns pbr** \<name> ALLOW [**-td** \<positive_integer>] [-**srcIP** [\<operator>] \<srcIPVal>] [-**srcPort** [\<operator>] \<srcPortVal>] [-**destIP** [\<operator>] \<destIPVal>] [-**destPort** [\<operator>] \<destPortVal>]  (-**nextHop NULL**) [**srcMac** \<mac_addr> [-**srcMacMask** \<string>]] [-**protocol** \<protocol> | -**protocolNumber** \<positive_integer>] [-**vlan** \<positive_integer> | -**vxlan** \<positive_integer>] [-**interface** \<interface_name>] [-**priority** \<positive_integer>] [-**msr** ( **ENABLED** | **DISABLED** ) [**-monitor** \<string>]] [-**state** ( **ENABLED** | **DISABLED** )[-**ownerGroup** \<string>]

-  **apply ns pbrs**
-  **show ns pbr**\<id>
<!--NeedCopy-->

To configure a NULL PBR by using the GUI:

Navigate to System > Network> PBRs, on the PBRs tab, add a new NULL PBR, or edit an existing NULL PBR.

Sample configuration

In the following sample configuration, NULL PBR6 PBR6-NULL-EXAMPLE-1 is configured for dropping any outgoing IPv6 packets from interface 1/5.

> add ns pbr PBR6-NULL-EXAMPLE-1 ALLOW –nextHop NULL -interface 1/5
 Done

> apply ns pbr6
 Done

The official version of this content is in English. Some of the Cloud Software Group documentation content is machine translated for your convenience only. Cloud Software Group has no control over machine-translated content, which may contain errors, inaccuracies or unsuitable language. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, suitability, or correctness of any translations made from the English original into any other language, or that your Cloud Software Group product or service conforms to any machine translated content, and any warranty provided under the applicable end user license agreement or terms of service, or any other agreement with Cloud Software Group, that the product or service conforms with any documentation shall not apply to the extent that such documentation has been machine translated. Cloud Software Group will not be held responsible for any damage or issues that may arise from using machine-translated content.

Using NULL Policy Based Routes to Drop Outgoing Packets

August 21, 2024

Contributed by:

C C

August 21, 2024

Contributed by:

C C

Using NULL Policy Based Routes to Drop Outgoing Packets

Configuring NULL PBRs for IPv4 Packets

Sample configuration

In this article