3Com 5500G, 4210, 4200G Precautions, Rules conflict, the last assigned rule takes effective

208CHAPTER 22: ACL CONFIGURATION GUIDE

Complete Configuration	#
	acl number 2000
	rule 1 deny source 10.1.1.1 0 time-range test
	#
	interface Ethernet1/0/1
	packet-filter inbound ip-group 2000 rule 1
	#
	time-range test 08:00 to 18:00 daily
	#
Precautions	■ If a packet matches multiple ACL rules at the same time and some actions of
	the rules conflict, the last assigned rule takes effective.

■When applying multiple rules, you are recommended to apply rules in the ascending order of their mask ranges and apply rues with the same mask range at the same time. This is to ensure that the actual operation of the rules is consistent with the requirements.

■Some functions and protocols configured on the device may occupy ACL rule resources. The actual occupation varies with functions and protocols.

Configuring Advanced Advanced ACLs filter packets based on Layer 3 and Layer 4 header information

ACLssuch as the source and destination IP addresses, type of the protocols carried by IP, protocol-specific features (such as TCP or UDP source port and destination port, ICMP message type and message code).

The numbers of advanced ACLs range from 3000 to 3999.

Network Diagram Figure 59 Network diagram for advanced ACL configuration

	To the router
	Wage query server
	192.168.1.2
Eth1/0/1	Eth1/0/2
	Switch
The R&D
department

Networking and Different departments of an enterprise are interconnected through a switch Configuration (assuming that the switch is a Switch 5500).The IP address of the wage query Requirements server is 192.168.1.2. The R&D department is connected to Ethernet 1/0/1 of the

switch. Apply an advanced ACL on the interface to deny access requests that are sourced from the R&D department and destined for the wage server during working hours (8:00 to 18:00).

Applicable Products

Product series	Software version	Hardware version
Switch 5500	Release V03.02.04	All versions