Asus GigaX2024SX - Manual (Page 81)

Access Control Lists
Access Control Lists (ACL) provide packet filtering for IP frames (based on
address, protocol, Layer 4 protocol port number or TCP control code) or any
frames (based on MAC address or Ethernet type). To filter incoming packets, first
create an access list, add the required rules, specify a mask to modify the
precedence in which the rules are checked, and then bind the list to a specific
port.
Configuring Access Control Lists
An ACL is a sequential list of permit or deny conditions that apply to IP addresses,
MAC addresses, or other more specific criteria. This switch tests ingress or
egress packets against the conditions in an ACL one by one. A packet will be
accepted as soon as it matches a permit rule, or dropped as soon as it matches a
deny rule. If no rules match for a list of all permit rules, the packet is dropped; and
if no rules match for a list of all deny rules, the packet is accepted.
ommand Usage
• The maximum number of ACLs is 88.
However, due to resource restrictions, the average number of rules bound to the
This switch supports ACLs for ingress filtering only. However, you can only bind
e bound to an interface - Ingress IP ACL and Ingress
MAC ACL.
The order in which active ACLs are checked is as follows:
1. User-defined rules in the Ingress MAC ACL for ingress ports.
2. User-defined rules in the Ingress IP ACL for ingress ports.
3. Explicit default rule (permit any any) in the ingress IP ACL for ingress ports.
4. Explicit default rule (permit any any) in the ingress MAC ACL for ingress ports.
5. If no explicit rule is matched, the implicit default is permit all.
Setting the ACL Name and Type
Use the ACL Configuration page to designate the name and type of an ACL.
Command Attributes
• Name – Name of the ACL. (Maximum length: 16 characters)
• Type – There are three filtering modes:
- Standard: IP ACL mode that filters packets based on the source IP address.
- Extended: IP ACL mode that filters packets based on source or destination IP
address, as well as protocol type and protocol port number. If the “TCP” protocol
C
The following restrictions apply to ACLs:
• Each ACL can have up to 32 rules.
•
ports should not exceed 20.
•
one IP ACL to any port and one MAC ACL globally for ingress filtering. In other
words, only two ACLs can b
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