Create Security Policies
Create security policy rules that will used to auto generate steering rules used in used in steering policy.
When you Generate Steering Rules, you will have the option to generate steering rules based on pre-rules, post-rules, or all. If you select All, the VMware plugin for NSX creates a steering rule for each applicable security in the pre and post rules. This can result in the creation of unnecessary steering rules and make managing the rules more difficult. To help easily separate your steering rules from your security rules, you can create your steering rules as post rules and security rules as pre rules.
To auto generate a steering rule based on a security rules created on Panorama, the security rule must meet the following criteria:
- Belongs to a parent or child device group registered with an NSX-T Service Manager.
- Is an intrazone policy and includes only one zone.
- Does not include a static address group, IP range, or netmask configured for the rule.
When deciding where to define your NSX-T steering rules in Panorama—pre or post rulesbase—consider the number of security policy rules and NSX-T steering rules you will create on Panorama and the order in which the rules are applied to traffic. Pre-rules are applied to traffic before post-rules.
- Pre-Rules—you can use the Panorama pre-rulebase to define your NSX-T steering rules and VM-Series firewall security policy rules. If your define the security rules and steering rules in the same rulebase, you must consider the order of the security rules relative to the steering rules. When you have a large rulebase that includes both steering rules and security policy rules, it might become difficult to manage both types of rules as you scale.
- Post-Rules—separating your security policy rules used for inspection and enforcement from the security rules used to generate NSX-T steering rules can help you scale in deployment with a large amount of rules. When you auto generate your steering rules, the plugin generates a steering rule for every rule in the specified rulebase that meets the necessary criteria. Therefore, by separating the two types of rules, you can prevent unintentionally generating extraneous steering rules. Use of the post rulebase for steering rules is recommended; especially in deployments with large amounts of security policy rules.
The source and destination dynamic address groups you specify in the security rule. When you auto generate a steering rule, where the rule is applied (NSX-T Distributed Firewall or Security Group) depends on the source and destination you specified when configuring the security rule. If you selected any for the source or destination, NSX-T Manager applies the steering rule to the Distributed Firewall. If you select a dynamic address group for the source and destination, the steering is applied to the guest VMs in those security groups. If you manually create steering rules, you can specify the security group(s) where the steering rule is applied.
Ensure that your security policy that is used to define steering rules do not include dynamic address groups configured as part of an operations-centric deployment workflow. If you do, the steering rules source and destination will be pushed to NSX-T Manager as source-any and destination-any. This might impact traffic in your NSX-T environment.
If you disable a security rule that you will use to auto generate a steering rule, the steering rule will be disabled as well.
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