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Overview of ACLs
Definition
An Access Control List (ACL) is a list of rules. These rules classify packets so that different types of packets can be processed differently.
Purpose
Devices need to communicate with each other on stable networks with reliable data transmission. For example, devices need to:
- Defend against various network attacks, such as attacks based on Internet Protocol (IP), Transmission Control Protocol (TCP), and Internet Control Message Protocol (ICMP) packets.
- Control network access. For example, control access to the enterprise network and external networks, specific network resources that users can access, and time ranges in which users can access networks.
- Limit network traffic and improve network performance. For example, limit bandwidth for upstream or downstream traffic and charge users for bandwidth they apply for, thus making full use of high-bandwidth network resources.
ACLs meet the above requirements, ensuring stability and reliability of network transmission.