Reflective ACL configuration on S series switch


On an S series switch, except S1700:
Reflective ACL is a type of dynamic ACL. It controls user access according to the upper-layer session information in IP packets to prevent hosts on the public network from connecting to the private network unless users on the private network connect to the public network first. In this way, the reflective ACL protects the private network of an enterprise against attacks from unauthorized external users.
For example, GE2/0/1 on a switch connects to the Internet. The reflective ACL is configured on GE 2/0/1 in the outbound direction to prevent the server on the Internet from accessing hosts on the internal network unless the internal hosts access the server first. The configurations are as follows:
[HUAWEI] acl 3000
[HUAWEI-acl-adv-3000] rule permit udp
[HUAWEI-acl-adv-3000] quit
[HUAWEI] interface gigabitethernet 2/0/1
[HUAWEI-GigabitEthernet2/0/1] traffic-reflect outbound acl 3000 timeout 600 //Configure reflective ACL on GE2/0/1 to match UDP packets and set the aging time.
[HUAWEI-GigabitEthernet2/0/1] quit
[HUAWEI] traffic-reflect timeout 900 //Set the global aging time for reflective ACL.

Run the display traffic-reflect command in the system view to view the reflective ACL information.

Other related questions:
Whether S series switches support reflective ACLs
Only the S series modular switches (except S1700 switches), for example, the S7700, S9700, S12700, and S9300 switches, support reflective ACLs.

Do CE series switches support reflective ACLs
CE series switches do not support reflective ACLs.

ACL configuration on S series switch
An ACL filters packets based on rules. A switch with an ACL configured matches packets based on the rules to obtain the packets of a certain type, and then decides to forward or discard these packets according to the policies used by the service module to which the ACL is applied. The S series switch supports basic ACL (2000-2999), advanced ACL (3000-3999), Layer 2 ACL (4000-4999), user-defined ACL (5000-5999), USER acl (6000-9999), basic ACL6 (2000-2999), and advanced ACL6 (3000-3999). For more information about the ACL feature supported by S series switches, except S1700, click S1720&S2700&S3700&S5700&S6700&S7700&S9700 Common Operation Guide or S1720&S2700&S3700&S5700&S6700&S7700&S9700 Typical Configuration Examples.

Do WLAN devices support reflective ACLs
ACs and APs do not support reflective ACLs.

Configure advanced ACLs on S series switches
A numbered ACL with the number ranging from 3000 to 3999 can be configured on an S series switch (except the S1700 switch). An advanced ACL defines rules based on source IPv4 addresses, destination IPv4 addresses, IPv4 protocol types, ICMP types, TCP source/destination port numbers, UDP source/destination port numbers, and time ranges. For example, configure a rule in ACL 3001 to allow the ICMP packets from and destined to network segment to pass. [HUAWEI] acl 3001 [HUAWEI-acl-adv-3001] rule permit icmp source 0 destination For another example, configure a rule in the advanced ACL no-web to forbid hosts and from accessing web pages (HTTP is used to access web pages, and TCP port number is 80), and configure the description for the ACL as Web access restrictions. [HUAWEI] acl name no-web [HUAWEI-acl-adv-no-web] description Web access restrictions [HUAWEI-acl-adv-no-web] rule deny tcp destination-port eq 80 source 0 [HUAWEI-acl-adv-no-web] rule deny tcp destination-port eq 80 source 0

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