Is it possible to add user-defined chains in IP firewall mangle?

User-defined chains can indeed be created in the IP firewall mangle section of MikroTik's RouterOS. This is a powerful feature that allows network administrators to have more granular control over packet processing. By defining custom chains, users can categorize and manage firewall rules to meet specific requirements that go beyond the default built-in chains.

In mangle processing, user-defined chains enable you to group related rules together, making it easier to manage and apply certain actions under specific conditions. For example, if you want to mark packets coming from a certain subnet, you can create a chain specifically for that purpose, which can streamline your configuration and enhance clarity.

The ability to add user-defined chains provides significant flexibility, as you can tailor the packet manipulation functions to your specific network topology and traffic management needs. This customization is essential for optimizing performance and ensuring that rules are evaluated efficiently, contributing positively to network security and traffic management strategies.