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Blocking Traffic on Internal Ports

August 1, 2023

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By default, a NetScaler appliance does not block some type of internal traffic even using ACL rules.

The following table lists the internal traffic types that a NetScaler appliance does not block even using ACL rules:

NetScaler Setup	Protocol	Destination Port	Destination IP address
All	TCP	3008–3011	NSIP or SNIP
All	TCP	179	NSIP or SNIP
All	UDP	520	NSIP or SNIP
High availability	UDP	3003	NSIP
High availability	TCP	22	NSIP
Cluster	UDP	7000	NSIP

This feature of not blocking the earlier mentioned types of traffic is specified by the default setting of the global Layer-3 Implicit ACL Allow (implicitACLAllow) parameter.

You can disable this parameter if you want to block the earlier mentioned traffic types using the ACL rules. An appliance in a high availability setup makes an exception for its partner (primary or secondary) node. It does not block traffic from that node.

To disable or enable this parameter by using the CLI:

At the command prompt, type:

set l3param -implicitACLAllow [ENABLED DISABLED]
sh l3param

Note: The parameter implicitACLAllow is enabled by default.

Example:

> set l3param -implicitACLAllow DISABLED
Done
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Blocking Traffic on Internal Ports

August 1, 2023

Contributed by:

August 1, 2023

Contributed by:

Blocking Traffic on Internal Ports

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